> 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/phase24-session03-browser-safe-evidence-assets-file-hardening/implementation_summary.md). # Implementation Summary **Session ID**: `phase24-session03-browser-safe-evidence-assets-file-hardening` **Completed**: 2026-06-08 **Duration**: 2.1 hours *** ## Overview Implemented browser-safe evidence asset support and hardened local file serving for Trend Finder. The session added private asset manifest helpers, loopback-only bridge handling, additive browser schema defaults, sanitized Engine Replay summaries, compact evidence preview affordances, and updated docs plus fixtures without exposing private paths or unapproved media. *** ## Deliverables ### Files Created | File | Purpose | Lines | | ------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------- | ----- | | `scripts/extensions/trend-finder/evidence-assets.ts` | Private asset manifest schema, safe IDs, path containment, retention, and pruning helpers | \~512 | | `scripts/extensions/trend-finder/__tests__/evidence-assets.test.ts` | Manifest validation, containment, blocked state, and pruning coverage | \~220 | | `scripts/lib/trend-finder-asset-bridge.ts` | Loopback-only local asset bridge with token, root, method, and content-type checks | \~238 | | `scripts/lib/__tests__/trend-finder-asset-bridge.test.ts` | Bridge hardening coverage for denied and allowed request paths | \~240 | | `src/extensions/trend-finder/components/evidence-asset-preview.tsx` | Compact asset preview and fallback component | \~121 | | `.spec_system/specs/phase24-session03-browser-safe-evidence-assets-file-hardening/IMPLEMENTATION_SUMMARY.md` | Session completion summary | \~120 | ### Files Modified | File | Changes | | ------------------------------------------------------------------- | ----------------------------------------------------------------------------------------- | | `src/extensions/trend-finder/schema.ts` | Added additive evidence asset and run summary defaults | | `src/extensions/trend-finder/engine-trace.ts` | Added bounded asset summary fields and safe trace sanitization | | `scripts/extensions/trend-finder/sources/types.ts` | Added reviewed asset candidate and support metadata contracts | | `scripts/extensions/trend-finder/sources/apify-normalizers.ts` | Kept unapproved media blocked while deriving reviewed asset states | | `scripts/extensions/trend-finder/collector.ts` | Merged asset manifest state and pruned stale entries from the active keep set | | `src/extensions/trend-finder/view-model.ts` | Projected asset metadata and fallback labels into evidence view models | | `src/extensions/trend-finder/components/evidence-links.tsx` | Wired evidence preview and fallback rendering into evidence cards | | `src/extensions/trend-finder/engine-replay-model.ts` | Added asset summary counts, tones, and notes for Engine Replay | | `src/extensions/trend-finder/views/engine-replay-view.tsx` | Surfaced asset availability and pruning states in the replay UI | | `src/extensions/trend-finder/fixtures.ts` | Added available, unsupported, blocked, failed, missing, and pruned asset fixtures | | `src/data/live-data.example.json` | Added additive fallback shape for asset fields | | `vite.config.ts` | Registered the asset bridge with explicit generated roots and refresh-token authorization | | `docs/extensions/trend-finder-ui-surfaces.md` | Documented asset preview behavior and fallback states | | `docs/extensions/trend-finder-pipeline.md` | Documented manifest, pruning, and bridge lifecycle behavior | | `docs/extensions/trend-finder-runtime-and-provenance.md` | Documented replay labels and privacy boundaries for assets | | `scripts/extensions/trend-finder/__tests__/collector.test.ts` | Extended collector coverage for manifest projection and degraded summaries | | `scripts/lib/ai-runtime/snapshots.ts` | Preserved legacy-compatible snapshot evidence handling | | `src/extensions/trend-finder/components/engine-evidence-filter.tsx` | Refined evidence filter handling for asset summary display | | `src/lib/__tests__/trend-finder-engine-replay.test.tsx` | Extended replay coverage for asset metrics and fallback states | | `src/lib/__tests__/trend-finder-schema.test.ts` | Extended schema coverage for asset defaults and ordering | *** ## Technical Decisions 1. **Additive browser contracts**: Legacy Trend Finder payloads keep parsing while new asset fields default to empty or unavailable states. 2. **Fail-closed local serving**: The bridge only serves explicit generated roots over loopback with token, method, path, size, and content-type checks. *** ## Test Results | Metric | Value | | -------- | ------------------------------------------------------------------------- | | Tests | 3023 total validation tests; 157 focused tests in the final session check | | Passed | 3023 total validation tests; 157 focused tests passed | | Coverage | N/A | *** ## Lessons Learned 1. Additive defaults and legacy-compatible fixtures prevented schema drift. 2. Keeping asset summaries to counts and labels avoided privacy regressions in browser-visible surfaces. *** ## Future Considerations 1. Session 04 can reuse the asset and bridge contracts when source setup and target configuration become UI-backed. 2. Session 07 can reuse the pruning and bridge hardening rules if static Brief export needs a browser-safe file-serving path. *** ## Session Statistics * **Tasks**: 25 completed * **Files Created**: 6 * **Files Modified**: 20 * **Tests Added**: 3 * **Blockers**: 0 resolved --- # 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. 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