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# Implementation Summary

**Session ID**: `phase07-session04-hosted-persistence-and-public-replay-boundaries` **Package**: Cross-cutting (`apps/server`, `apps/web`, `packages/protocol`; docs) **Completed**: 2026-05-30 **Duration**: 0.3 hours

***

## Overview

Defined the hosted persistence and public replay boundary for Phase 07, with shared protocol contracts, status-only server diagnostics, browser helpers, and stable docs that keep hosted storage and public replay disabled or unavailable until later phases.

***

## Deliverables

### Files Created

| File                                                                                                             | Purpose                                                           | Lines |
| ---------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- | ----- |
| `.spec_system/PRD/phase_07/hosted_persistence_public_replay_boundaries.md`                                       | Source-backed hosted persistence and public replay baseline       | \~260 |
| `packages/protocol/src/hostedPersistence.ts`                                                                     | Shared posture contracts, requirements, and summary helpers       | \~260 |
| `packages/protocol/tests/hostedPersistence.test.ts`                                                              | Protocol contract coverage                                        | \~180 |
| `apps/server/src/lib/hostedPersistence.ts`                                                                       | Local diagnostics builder                                         | \~130 |
| `apps/server/tests/hostedPersistenceDiagnostics.test.ts`                                                         | Diagnostics route coverage                                        | \~160 |
| `apps/web/src/lib/hostedPersistence.ts`                                                                          | Browser helper for disabled hosted persistence and local fallback | \~150 |
| `apps/web/tests/hostedPersistence.test.ts`                                                                       | Browser helper coverage                                           | \~140 |
| `.spec_system/specs/phase07-session04-hosted-persistence-and-public-replay-boundaries/IMPLEMENTATION_SUMMARY.md` | Session closeout summary                                          | \~120 |

### Files Modified

| File                                        | Changes                                                  |
| ------------------------------------------- | -------------------------------------------------------- |
| `packages/protocol/src/index.ts`            | Exported the hosted persistence contract module          |
| `apps/server/src/routes/diagnostics.ts`     | Added `GET /diagnostics/hosted-persistence`              |
| `apps/server/src/server.ts`                 | Wired hosted persistence diagnostics option plumbing     |
| `apps/web/tests/replayLink.test.ts`         | Added fragment-based replay regression assertions        |
| `docs/api/README_api.md`                    | Documented hosted persistence diagnostics posture        |
| `docs/hosted-services.md`                   | Added Session 04 storage and replay guardrails           |
| `docs/privacy-and-security.md`              | Added payload, retention, deletion, and takedown limits  |
| `docs/ARCHITECTURE.md`                      | Added protocol-first planned-state guidance              |
| `docs/environments.md`                      | Clarified reserved storage and public replay variables   |
| `docs/deployment.md`                        | Clarified deployment is not storage or erasure proof     |
| `docs/release.md`                           | Added release guardrails and Phase 08 deferrals          |
| `packages/protocol/README_protocol.md`      | Documented protocol ownership of the guardrail contracts |
| `apps/server/README_server.md`              | Documented diagnostics posture and redaction boundaries  |
| `apps/web/README_web.md`                    | Documented browser helper and local replay fallback      |
| `.spec_system/state.json`                   | Marked the session complete and advanced history         |
| `.spec_system/PRD/phase_07/PRD_phase_07.md` | Updated phase progress and session tracker               |
| `package.json`                              | Bumped patch version                                     |

***

## Technical Decisions

1. **Protocol-first posture**: Shared eligibility and replay vocabulary lives in `packages/protocol` so server and web consumers cannot drift.
2. **Status-only diagnostics**: Hosted persistence surfaces report planned or unavailable state without raw env values, payloads, or account data.
3. **Local fallback preserved**: Browser replay sharing remains fragment-based and local-first rather than introducing hosted upload behavior.

***

## Test Results

| Metric   | Value   |
| -------- | ------- |
| Tests    | 4 files |
| Passed   | 70      |
| Coverage | N/A     |

***

## Lessons Learned

1. The hosted boundary is safer when the negative claims are explicit in both protocol summaries and docs.
2. The existing local replay fragment flow is the correct compatibility anchor until a later phase owns hosted replay infrastructure.

***

## Future Considerations

Items for future sessions:

1. Analytics consent and payload controls in Session 05.
2. Push, remote access, and operator diagnostics guardrails in Session 06.
3. Trusted unified erasure and release hardening in Phase 08.

***

## Session Statistics

* **Tasks**: 25 completed
* **Files Created**: 8
* **Files Modified**: 17
* **Tests Added**: 3
* **Blockers**: 0 resolved


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