> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase38-session02-platform-foundation/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase38-session02-platform-foundation` **Started**: 2026-06-29 18:37 **Last Updated**: 2026-06-29 18:55

***

## Session Progress

| Metric              | Value   |
| ------------------- | ------- |
| Tasks Completed     | 18 / 18 |
| Estimated Remaining | 0 hours |
| Blockers            | 0       |

***

### Task T018 - Validate file hygiene and implementation evidence

**Started**: 2026-06-29 18:54 **Completed**: 2026-06-29 18:55 **Duration**: 1 minute

**Notes**:

* Validated changed implementation and session files for ASCII-only content.
* Validated changed implementation and session files for LF line endings by scanning for CR characters.
* Confirmed no dependency manifests or lockfiles changed.
* Confirmed task checklist evidence is complete before handoff to code review.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T018 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T018 and completion checklist items complete.

**Verification**:

* Command/check: `rg -n "[^\\x00-\\x7F]" scripts/lib/platform.ts scripts/lib/scan-helpers.ts scripts/lib/tool-detection.ts scripts/lib/__tests__/platform.test.ts scripts/lib/__tests__/scan-helpers.test.ts scripts/lib/__tests__/tool-detection.test.ts .spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md .spec_system/specs/phase38-session02-platform-foundation/tasks.md`
  * Result: PASS - no non-ASCII content found in touched implementation or session files.
  * Evidence: command returned no matches.
* Command/check: `rg -n $'\\r' scripts/lib/platform.ts scripts/lib/scan-helpers.ts scripts/lib/tool-detection.ts scripts/lib/__tests__/platform.test.ts scripts/lib/__tests__/scan-helpers.test.ts scripts/lib/__tests__/tool-detection.test.ts .spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md .spec_system/specs/phase38-session02-platform-foundation/tasks.md`
  * Result: PASS - no CR characters found.
  * Evidence: command returned no matches.
* Command/check: `git diff --name-only -- package.json bun.lock bun.lockb pnpm-lock.yaml package-lock.json yarn.lock`
  * Result: PASS - no dependency manifest or lockfile changes.
  * Evidence: command returned no files.
* Command/check: `rg -n "\\[ \\] T|\\[x\\] T" .spec_system/specs/phase38-session02-platform-foundation/tasks.md`
  * Result: PASS - checklist had T001 through T017 complete and only T018 pending before final task update.
  * Evidence: final patch marks T018 complete after this evidence entry.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* N/A - final hygiene task; no runtime code changed.

***

### Task T017 - Run script typecheck

**Started**: 2026-06-29 18:54 **Completed**: 2026-06-29 18:54 **Duration**: 1 minute

**Notes**:

* Ran the required script typecheck after all platform, scan-helper, tool-detection, and test updates.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T017 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T017 complete.

**Verification**:

* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* N/A - verification task; no runtime code changed.

***

### Task T016 - Run targeted platform, scan-helper, and tool-detection tests

**Started**: 2026-06-29 18:53 **Completed**: 2026-06-29 18:53 **Duration**: 1 minute

**Notes**:

* Ran the exact targeted command required by the session spec across platform, scan-helper, and tool-detection tests.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T016 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T016 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/platform.test.ts scripts/lib/__tests__/scan-helpers.test.ts scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - targeted test suite passed.
  * Evidence: 3 test files passed; 81 tests passed.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* N/A - verification task; no runtime code changed.

***

### Task T015 - Extend tool-detection resolver tests

**Started**: 2026-06-29 18:52 **Completed**: 2026-06-29 18:53 **Duration**: 1 minute

**Notes**:

* Added resolver-level coverage for injected Windows PATHEXT values.
* Added explicit coverage for Windows command candidates found through POSIX-home fallback directories in injected test harnesses.
* Added resolver coverage for shared mise fallback directories.

**Files Changed**:

* `scripts/lib/__tests__/tool-detection.test.ts` - added Windows candidate and shared fallback resolver tests.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T015 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T015 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - tool-detection tests passed after resolver coverage additions.
  * Evidence: 1 test file passed; 30 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after tool-detection test updates.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: resolver tests now cover shared fallback directory contracts and injected Windows executable expansion.

***

### Task T014 - Update scan-helper platform re-export tests

**Started**: 2026-06-29 18:51 **Completed**: 2026-06-29 18:52 **Duration**: 1 minute

**Notes**:

* Added scan-helper tests proving moved platform primitives remain available through the existing `scan-helpers` import path.
* Added assertions for home redaction and app-support path helpers.

**Files Changed**:

* `scripts/lib/__tests__/scan-helpers.test.ts` - added platform re-export assertions.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T014 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T014 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/scan-helpers.test.ts`
  * Result: PASS - scan-helper tests passed after re-export assertions.
  * Evidence: 1 test file passed; 42 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after scan-helper test updates.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: existing scan-helper import path is tested for moved platform-owned helpers.

***

### Task T013 - Add direct platform CLI tests

**Started**: 2026-06-29 18:50 **Completed**: 2026-06-29 18:51 **Duration**: 1 minute

**Notes**:

* Added direct tests for Windows PATHEXT normalization and executable-name expansion.
* Added direct tests for POSIX PATH-first candidate directory ordering, duplicate removal, and bounded nvm version-bin expansion.
* Added direct tests for Windows `%APPDATA%\npm`, `%LOCALAPPDATA%\Programs`, semicolon PATH splitting, and duplicate removal.

**Files Changed**:

* `scripts/lib/__tests__/platform.test.ts` - added CLI executable and candidate-directory contract tests.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T013 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T013 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/platform.test.ts`
  * Result: PASS - platform helper tests passed after CLI coverage was added.
  * Evidence: 1 test file passed; 9 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after adding CLI platform tests.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: CLI name and candidate-directory behavior is directly covered at the shared helper boundary.

***

### Task T012 - Add direct platform OS/path/app-data/venv tests

**Started**: 2026-06-29 18:49 **Completed**: 2026-06-29 18:50 **Duration**: 1 minute

**Notes**:

* Added direct platform tests for injected Windows, macOS, and Linux OS flags.
* Covered `toPosix`, home expansion, home redaction, app-data roots, app-support paths, venv binary paths, and shell lookup command selection.
* Kept tests pure with injected platform, home, and env inputs.

**Files Changed**:

* `scripts/lib/__tests__/platform.test.ts` - added direct platform branch coverage for OS, path, app-data, app-support, and venv helpers.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T012 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T012 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/platform.test.ts`
  * Result: PASS - new platform tests passed.
  * Evidence: 1 test file passed; 6 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after adding platform tests.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: branch tests prove helper contracts without mutating process globals.

***

### Task T011 - Verify public script exports and consumers

**Started**: 2026-06-29 18:48 **Completed**: 2026-06-29 18:48 **Duration**: 1 minute

**Notes**:

* Checked existing script imports from `scan-helpers` and `tool-detection`.
* Confirmed no downstream consumer import rewrites were required.
* Verified focused scan-helper and tool-detection tests together after the shared-helper refactor.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T011 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T011 complete.

**Verification**:

* Command/check: `rg -n "from ['\\\"](\\.\\.?/)?scan-helpers['\\\"]|from ['\\\"](\\.\\.?/)?tool-detection['\\\"]" scripts -g '*.ts'`
  * Result: PASS - existing consumers still import through the established helper modules.
  * Evidence: current consumers reference `scan-helpers` and `tool-detection`; no consumer import path rewrites were needed.
* Command/check: `bun run test -- scripts/lib/__tests__/scan-helpers.test.ts scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - focused helper tests passed together.
  * Evidence: 2 test files passed; 67 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - downstream script imports compiled.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: existing script consumers continue to compile against the preserved helper export surface.

***

### Task T010 - Remove duplicate local tool-detection helpers

**Started**: 2026-06-29 18:47 **Completed**: 2026-06-29 18:48 **Duration**: 1 minute

**Notes**:

* Removed local `executableNames`, `candidateCliDirectories`, PATH dedupe, child directory, and node-version bin helper functions from `scripts/lib/tool-detection.ts`.
* Removed now-unused `node:os`, `node:path` delimiter, and `readdirSync` imports.
* Left `tool-detection.ts` focused on executable probing and process version probing.

**Files Changed**:

* `scripts/lib/tool-detection.ts` - removed duplicate local platform helper logic.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T010 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T010 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - resolver behavior stayed green after duplicate helper removal.
  * Evidence: 1 test file passed; 27 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after duplicate helper removal.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: eliminated duplicate platform branches so resolver behavior has one source of truth.

***

### Task T009 - Refactor tool detection to shared platform helpers

**Started**: 2026-06-29 18:44 **Completed**: 2026-06-29 18:47 **Duration**: 3 minutes

**Notes**:

* Refactored `resolveCliPath` to use shared `candidateCliDirectories` and `executableNames` from `scripts/lib/platform.ts`.
* Added optional injected environment support to `ResolveCliOptions` so PATH and PATHEXT behavior can be tested without mutating process globals.
* Preserved PATH-first ordering and existing POSIX resolver behavior.
* Fixed the shared Windows candidate helper to include POSIX-home compatibility fallbacks when tests inject a POSIX temp home with `platform: "win32"`.

**Files Changed**:

* `scripts/lib/tool-detection.ts` - wired resolver path and executable candidate construction to the shared platform helper.
* `scripts/lib/platform.ts` - added POSIX-home compatibility fallback for injected Windows resolver tests.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T009 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T009 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - tool-detection behavior stayed green after the resolver refactor.
  * Evidence: 1 test file passed; 27 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after tool-detection integration.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: resolver now consumes the same shared candidate contracts that direct platform tests will cover.
* Failure path completeness: retained resolver `undefined` behavior for missing or non-executable candidates.

***

## Task Log

### 2026-06-29 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed
* [x] Tools available
* [x] Directory structure ready

***

### Task T001 - Verify platform helper owners

**Started**: 2026-06-29 18:36 **Completed**: 2026-06-29 18:37 **Duration**: 1 minute

**Notes**:

* Verified upstream `scripts/platform.ts` provides OS flags, `toPosix`, app-data, app-support, `whichCommand`, and `venvBin` concepts.
* Confirmed current AI OS platform logic is split between `scripts/lib/scan-helpers.ts` for home, macOS, expansion, redaction, and app paths, and `scripts/lib/tool-detection.ts` for executable names, PATH splitting, fallback directories, and node version bins.
* Confirmed existing test owners are `scripts/lib/__tests__/scan-helpers.test.ts` and `scripts/lib/__tests__/tool-detection.test.ts`.
* Reviewed `docs/adr/0001-extension-platform-foundation.md`; static script-side registration and explicit utilities remain the architectural boundary.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded implementation evidence for the owner verification task.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T001 complete.

**Verification**:

* Command/check: `sed -n '1,260p' /home/aiwithapex/projects/claudeos/claude-os-v2.8.1/scripts/platform.ts`
  * Result: PASS - upstream helper concepts inspected.
  * Evidence: identified OS flags, app-data helpers, app-support helper, `toPosix`, `whichCommand`, and `venvBin`.
* Command/check: `sed -n '1,620p' scripts/lib/scan-helpers.ts` and `sed -n '1,320p' scripts/lib/tool-detection.ts`
  * Result: PASS - current AI OS owner files inspected.
  * Evidence: verified duplicated platform-owned logic before extraction.
* Command/check: `sed -n '1,700p' scripts/lib/__tests__/scan-helpers.test.ts` and `sed -n '1,700p' scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - existing test owners inspected.
  * Evidence: scan-helper and tool-detection tests cover current behavior and will be extended.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* N/A - evidence-only task; no runtime code changed.

***

### Task T002 - Record baseline targeted checks

**Started**: 2026-06-29 18:37 **Completed**: 2026-06-29 18:38 **Duration**: 1 minute

**Notes**:

* Ran the existing targeted test owners before source edits.
* Ran the script typecheck before source edits.
* Established baseline behavior for later regression comparison.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded baseline command evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T002 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/scan-helpers.test.ts scripts/lib/__tests__/tool-detection.test.ts`
  * Result: PASS - targeted baseline tests passed.
  * Evidence: 2 test files passed; 67 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled with no emitted output.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* N/A - evidence-only task; no runtime code changed.

***

### Task T003 - Confirm root platform re-export is unnecessary

**Started**: 2026-06-29 18:38 **Completed**: 2026-06-29 18:39 **Duration**: 1 minute

**Notes**:

* Confirmed no code importer currently references a root-level `scripts/platform.ts`.
* Confirmed no existing `scripts/platform.ts` file is present.
* Decision: no compatibility re-export is needed for this session; keep the shared helper at `scripts/lib/platform.ts`.

**Files Changed**:

* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded compatibility re-export evidence and decision.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T003 complete.

**Verification**:

* Command/check: `rg -n "scripts/platform|\\.\\.?/platform|platform\\.ts|from ['\\\"]\\.\\.?/.*/platform|from ['\\\"]\\.\\.?/platform" scripts src tests .spec_system -g '*.ts' -g '*.tsx' -g '*.md'`
  * Result: PASS - no runtime code importers found.
  * Evidence: matches were planning/spec references under `.spec_system`, not imports from `scripts`, `src`, or `tests`.
* Command/check: `find scripts -maxdepth 2 -name 'platform.ts' -print`
  * Result: PASS - no existing root-level platform file found.
  * Evidence: command returned no files.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: avoided adding a root re-export because no current consumer contract requires it.

***

### Task T004 - Create platform option types and OS flags

**Started**: 2026-06-29 18:39 **Completed**: 2026-06-29 18:41 **Duration**: 2 minutes

**Notes**:

* Created `scripts/lib/platform.ts`.
* Added injectable `PlatformOptions`, `PlatformEnv`, and `PlatformFlags` contracts.
* Added current-process constants and pure helpers for resolving platform, home, environment, and OS flags.
* Added internal platform-aware path API helpers for later branch-specific path construction.

**Files Changed**:

* `scripts/lib/platform.ts` - added shared platform context types, runtime constants, and OS flag helpers.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T004 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T004 complete.

**Verification**:

* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after adding `scripts/lib/platform.ts`.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: helper options expose platform, home, and env injection without mutating process globals.

***

### Task T005 - Add path and app-data helpers

**Started**: 2026-06-29 18:41 **Completed**: 2026-06-29 18:42 **Duration**: 1 minute

**Notes**:

* Added `toPosix` for pure separator normalization.
* Added injectable `expandHomePath` and `redactHomePath` helpers.
* Added `appData`, `localAppData`, and `appSupportDir` helpers with explicit Windows, macOS, and Linux branches.
* Preserved stable redaction output with `~/...` labels across platforms.

**Files Changed**:

* `scripts/lib/platform.ts` - added path normalization, home expansion/redaction, app-data, local-app-data, and app-support helpers.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T005 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T005 complete.

**Verification**:

* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after adding path and app-data helpers.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: path helpers use explicit injected platform/home/env inputs and keep process defaults only as caller defaults.

***

### Task T006 - Add venv and executable-name helpers

**Started**: 2026-06-29 18:42 **Completed**: 2026-06-29 18:43 **Duration**: 1 minute

**Notes**:

* Added `whichCommand` for Windows `where` versus POSIX `which`.
* Added Windows PATHEXT normalization and duplicate removal.
* Added `executableNames` with bare command first, extension preservation when the command already has an extension, and deterministic Windows extension expansion.
* Added `venvBin` with POSIX `bin` and Windows `Scripts` behavior, avoiding duplicate executable extensions.

**Files Changed**:

* `scripts/lib/platform.ts` - added venv binary and executable-name helpers.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T006 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T006 complete.

**Verification**:

* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after adding venv and executable-name helpers.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: Windows executable-name expansion is deterministic and keeps caller-supplied extensions intact.

***

### Task T007 - Add CLI candidate-directory helpers

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:43 **Duration**: 1 minute

**Notes**:

* Added platform-aware PATH delimiter handling.
* Added `candidateCliDirectories` with PATH entries first, deterministic duplicate removal, and `extraDirs` appended after fallback directories.
* Preserved existing POSIX fallback ordering for local bin, package-manager, homebrew, and system directories.
* Added Windows fallback directories for `%APPDATA%\npm`, home manager dirs, and `%LOCALAPPDATA%\Programs`.
* Added bounded, numerically sorted nvm/fnm node-version bin expansion with injectable directory readers for deterministic tests.

**Files Changed**:

* `scripts/lib/platform.ts` - added bounded CLI candidate-directory helpers.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T007 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T007 complete.

**Verification**:

* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after adding CLI candidate-directory helpers.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: candidate directories are deterministic, PATH-first, duplicate-free, and bounded for node-version expansions.

***

### Task T008 - Refactor scan helpers to shared platform primitives

**Started**: 2026-06-29 18:43 **Completed**: 2026-06-29 18:43 **Duration**: 1 minute

**Notes**:

* Refactored `scripts/lib/scan-helpers.ts` to import `HOME`, `IS_MACOS`, `expandHomePath`, and `redactHomePath` from `scripts/lib/platform.ts`.
* Re-exported the platform primitives from `scan-helpers.ts` so existing consumers keep their current import contract.
* Added `appSupportDir` to the scan-helper re-export surface for shared app-support path use without adding scanner output changes.

**Files Changed**:

* `scripts/lib/scan-helpers.ts` - replaced local HOME/macOS/home-path logic with platform imports and re-exports.
* `.spec_system/specs/phase38-session02-platform-foundation/implementation-notes.md` - recorded T008 evidence.
* `.spec_system/specs/phase38-session02-platform-foundation/tasks.md` - marked T008 complete.

**Verification**:

* Command/check: `bun run test -- scripts/lib/__tests__/scan-helpers.test.ts`
  * Result: PASS - scan-helper behavior stayed green after the refactor.
  * Evidence: 1 test file passed; 40 tests passed.
* Command/check: `bun run typecheck:scripts`
  * Result: PASS - script TypeScript project compiled successfully after scan-helper integration.
  * Evidence: `tsc --noEmit -p tsconfig.scripts.json` exited successfully.
* UI product-surface check: N/A - script helper session with no user-facing route changes.
* UI craft check: N/A - script helper session with no rendered UI.

**BQC Fixes**:

* Contract alignment: scan-helper exports remain available to existing consumers while platform-owned behavior moved to the shared module.

***


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase38-session02-platform-foundation/implementation-notes.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.