> 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/phase23-session04-store-persistence-boundaries/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase23-session04-store-persistence-boundaries` **Package**: apps/web **Completed**: 2026-07-05 **Duration**: 0.5 hours

***

## Overview

Session 04 proved scanner camp aggregates use the existing browser-local game projection persistence path in `apps/web`. The session added store-level and browser-local erasure regressions for real scanner camp persistence, replay guards, mock-mode non-persistence, hydration reconciliation, reset cleanup, aggregate-only serialized projection data, and absence of new camp-specific storage keys. No application source repair was needed.

***

## Deliverables

### Files Created

| File                                                                                          | Purpose                         | Lines |
| --------------------------------------------------------------------------------------------- | ------------------------------- | ----- |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/spec.md`                   | Session specification and scope | 340   |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/tasks.md`                  | Completed task checklist        | 62    |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/implementation-notes.md`   | Implementation evidence log     | 429   |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/code-review.md`            | Review and repair report        | 77    |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/security-compliance.md`    | Security and GDPR review        | 87    |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/validation.md`             | Validation report               | 177   |
| `.spec_system/specs/phase23-session04-store-persistence-boundaries/IMPLEMENTATION_SUMMARY.md` | Session closeout summary        | \~80  |

### Files Modified

| File                                         | Changes                                                                                                                               |
| -------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| `apps/web/tests/gameProjectionStore.test.ts` | Added six focused store-level scanner camp persistence, replay, mock, hydration, reset, and storage privacy regressions plus helpers. |
| `apps/web/tests/localErasure.test.ts`        | Added browser-local erasure coverage for aggregate projection storage cleanup and camp-specific storage-key inventory.                |
| `.spec_system/state.json`                    | Marked Session 04 completed, cleared `current_session`, appended completed history, and preserved the rolling 20-entry history.       |
| `.spec_system/PRD/phase_23/PRD_phase_23.md`  | Marked Session 04 complete and updated phase progress to 4/8 sessions.                                                                |
| `apps/web/package.json`                      | Bumped `@factionos/web` from `0.1.68` to `0.1.69`.                                                                                    |
| `package-lock.json`                          | Synchronized the `apps/web` package entry to `0.1.69`.                                                                                |

***

## Technical Decisions

1. **Keep `GAME_PROJECTION_STORAGE_KEY` as the only durable camp authority**: Tests assert scanner camp aggregates persist only through `localStorage["factionos-game-v1"]` and reject new camp, legion, or scanner-specific browser keys.
2. **Use store-level regressions rather than production rewiring**: Existing store, projection, reset, and erasure paths already satisfied the session contract, so the durable change is test coverage.
3. **Treat replay and mock paths as progress-inert boundaries**: Replayed scanner snapshots stay camp-inert, and mock scanner camps can fold in memory without changing persisted projection bytes.

***

## Test Results

| Metric        | Value                              |
| ------------- | ---------------------------------- |
| Focused Tests | 31 passed                          |
| Root Tests    | 3233 passed, 1 skipped             |
| Typecheck     | PASS                               |
| Coverage      | Not emitted by validation commands |

***

## Lessons Learned

1. The existing projection persistence lifecycle already had the right flush, replay, mock, reset, and browser-local erasure seams for camp aggregates.
2. Storage inventory assertions are useful protection against accidentally creating a second local state authority in future camp-facing sessions.

***

## Future Considerations

Items for future sessions:

1. Session 05 should reuse these persistence guarantees when Quest Board camp focus and Banish behavior inspect real issue cards.
2. Session 06 should render battlefield camps from the existing projection aggregate without adding a new game-state authority.
3. Session 07 should preserve the mock and clean-scan boundaries when adding scanner lifecycle and Golden Age states.
4. Session 08 should include these storage and erasure regressions in the final phase validation evidence.

***

## Session Statistics

* **Tasks**: 16 completed
* **Files Created**: 7
* **Files Modified**: 6
* **Tests Added**: 6
* **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. 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://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase23-session04-store-persistence-boundaries/implementation_summary.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.