# Sprint 185 - Replay Core · 185.A) Shared Replay Primitives

[Replay Core] 185.A) Shared Replay Primitives
Depends on: Sprint 160 Export & Evidence
Summary: Stand up a shared replay library, hashing/cononicalisation helpers, and baseline documentation for deterministic bundles.

Task ID | State | Task description | Owners (Source)
--- | --- | --- | ---
REPLAY-CORE-185-001 | DONE (2025-11-28) | Scaffold `StellaOps.Replay.Core` with manifest schema types, canonical JSON rules, Merkle utilities, and DSSE payload builders; add `AGENTS.md`/`TASKS.md` for the new library; cross-reference `docs/replay/DETERMINISTIC_REPLAY.md` section 3 when updating the library charter. | BE-Base Platform Guild (`src/__Libraries/StellaOps.Replay.Core`)
REPLAY-CORE-185-002 | DONE (2025-11-28) | Implement deterministic bundle writer (tar.zst, CAS naming) and hashing abstractions, updating `docs/modules/platform/architecture-overview.md` with a "Replay CAS" subsection that documents layout/retention expectations. | Platform Guild (src/__Libraries/StellaOps.Replay.Core)
REPLAY-CORE-185-003 | DONE (2025-11-28) | Define Mongo collections (`replay_runs`, `replay_bundles`, `replay_subjects`) and indices, then author `docs/data/replay_schema.md` detailing schema fields, constraints, and offline sync strategy. | Platform Data Guild (src/__Libraries/StellaOps.Replay.Core)
DOCS-REPLAY-185-003 | DONE (2025-11-28) | Author `docs/data/replay_schema.md` detailing `replay_runs`, `replay_bundles`, `replay_subjects` collections, index guidance, and offline sync strategy aligned with Replay CAS. | Docs Guild, Platform Data Guild (docs)
DOCS-REPLAY-185-004 | DONE (2025-11-28) | Expand `docs/replay/DEVS_GUIDE_REPLAY.md` with integration guidance for consuming services (Scanner, Evidence Locker, CLI) and add checklist derived from `docs/replay/DETERMINISTIC_REPLAY.md` Section 11. | Docs Guild (docs)

> 2025-11-03: Replay CAS section published in `docs/modules/platform/architecture-overview.md` §5 — owners can move REPLAY-CORE-185-001/002 to **DOING** once library scaffolding begins.

## Implementation Status (2025-11-28)

All tasks verified complete:

- **REPLAY-CORE-185-001**: Library scaffolded with `CanonicalJson.cs`, `DeterministicHash.cs`, `DsseEnvelope.cs`, `ReplayManifest.cs`, `ReplayManifestExtensions.cs`; `AGENTS.md` published.
- **REPLAY-CORE-185-002**: `ReplayBundleWriter.cs` and `ReplayBundleEntry.cs` implement tar.zst CAS bundle operations; Replay CAS documented in architecture-overview.md §5.
- **REPLAY-CORE-185-003**: `ReplayMongoModels.cs` defines `ReplayRunDocument`, `ReplayBundleDocument`, `ReplaySubjectDocument` with `ReplayIndexes` constants.
- **DOCS-REPLAY-185-003**: `docs/data/replay_schema.md` published with collection schemas, indexes, and determinism constraints.
- **DOCS-REPLAY-185-004**: `docs/replay/DEVS_GUIDE_REPLAY.md` expanded with developer checklist, storage schema references, and workflow guidance.