> For the complete documentation index, see [llms.txt](https://faction-os.gitbook.io/faction-os-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase22-session02-hero-attention-reducer/implementation_summary.md). # Implementation Summary **Session ID**: `phase22-session02-hero-attention-reducer` **Package**: apps/web **Completed**: 2026-07-05 **Duration**: 1.2 hours *** ## Overview Completed the Phase 22 hero-attention reducer slice for `apps/web`. The session expanded `gameProjection.ts` with privacy-safe attention refs, immutable hero aggregate reconciliation, flare and gate reducers, deterministic alert focus priority, replay-safe swift-command counters, and backward-compatible persisted-shape parsing. Focused Vitest coverage now proves reducer purity, hero preservation, flare and gate lifecycle behavior, priority promotion, replay safety, parser compatibility, and sensitive-string exclusions. *** ## Deliverables ### Files Created | File | Purpose | Lines | | --------------------------------------------------------------------------------------- | ------------------------------------------------- | ----- | | `.spec_system/specs/phase22-session02-hero-attention-reducer/spec.md` | Session specification and success criteria. | 197 | | `.spec_system/specs/phase22-session02-hero-attention-reducer/tasks.md` | Completed task checklist for the session. | 67 | | `.spec_system/specs/phase22-session02-hero-attention-reducer/implementation-notes.md` | Task-by-task implementation evidence. | 696 | | `.spec_system/specs/phase22-session02-hero-attention-reducer/code-review.md` | Review and repair record with RESOLVED result. | 62 | | `.spec_system/specs/phase22-session02-hero-attention-reducer/security-compliance.md` | Security and GDPR review for session changes. | 82 | | `.spec_system/specs/phase22-session02-hero-attention-reducer/validation.md` | Final PASS validation report and evidence ledger. | 206 | | `.spec_system/specs/phase22-session02-hero-attention-reducer/IMPLEMENTATION_SUMMARY.md` | Final updateprd implementation summary. | 101 | ### Files Modified | File | Changes | | ------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `apps/web/src/lib/gameProjection.ts` | Added attention aggregate types, strict guards, Session 01 normalization, hero lifecycle reducers, flare reducers, gate reducers, alert-focus ordering, and replay-safe reducer finalization. | | `apps/web/tests/gameProjection.test.ts` | Added focused Vitest coverage for reducer purity, hero lifecycle preservation, flare lifecycle, gate lifecycle, alert priority, replay safety, parser compatibility, and privacy serialization exclusions. | | `.spec_system/state.json` | Marks Session 02 complete, clears `current_session`, and appends completed session history. | | `.spec_system/PRD/phase_22/PRD_phase_22.md` | Marks Session 02 complete and updates Phase 22 progress to 2/8 sessions. | | `apps/web/package.json` | Increments package patch version for the completed apps/web session. | | `package-lock.json` | Keeps the apps/web package version in sync with `apps/web/package.json`. | *** ## Technical Decisions 1. **Attention refs are aggregate-only**: Stored ids, source families, optional hero ids, and timestamps only, excluding prompt, rationale, detail, expected result, terminal output, file content, tokens, secrets, and broad paths. 2. **Alert focus is recomputed**: `alertFocus` is derived from projection state in the priority order `flare > gate > siege > ram > skirmisher > newCamp > null`, with deterministic same-tier ordering. 3. **Replay reconciles without minting progress**: Replay mode can clear stale attention but does not increase flare ceremony or swift-command counters. *** ## Test Results | Metric | Value | | ------------------- | ---------------------------------- | | Focused Tests | 16 passed | | Root Tests | 3175 passed, 1 skipped | | Web Typecheck | PASS | | Workspace Typecheck | PASS | | Biome Check | PASS | | Coverage | Not emitted by configured commands | *** ## Lessons Learned 1. Projection attention state needs explicit privacy tests because permission and prompt events carry sensitive local details near the fields needed for focus routing. 2. Stable same-reference reducer behavior is easier to preserve when alert focus is recomputed during finalization instead of patched per event case. *** ## Future Considerations Items for future sessions: 1. Session 03 should add Legion enemy reducers while preserving the alert-focus priority contract created here. 2. Session 05 should fold this reducer through the store event-apply path using the same-reference no-op behavior for persistence efficiency. 3. Session 08 should keep trusted erasure wording narrow because this session only adds browser-local aggregate refs. *** ## Session Statistics * **Tasks**: 21 completed * **Files Created**: 7 * **Files Modified**: 6 * **Tests Added**: 16 * **Blockers**: 0 resolved --- # Agent Instructions This documentation is published with GitBook. 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