feat: project Pi conversation events

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# Task: Implement PI-060 event projector and recovery
## Identity
- Task ID: 20260823-pi-event-projector-91c6a7e4
- Mode: Feature
- Branch: codex/20260823-pi-event-projector-91c6a7e4-pi-event-projector
- Worktree: D:\Datas\OthersProjects\makelore-pi-event-projector-91c6a7e4
- Base commit: e79aeffffab16c4c5570971e24d1a20997be681d
- Owner: codex
- Status: Completed
## Scope
- Implement `PI-060 — Event projector, hydration, and recovery` on top of
PI-050 commit `e79aeffffab16c4c5570971e24d1a20997be681d`.
- Own Main-private Pi live-event projection, persisted active-branch hydration,
durable reconciliation, generation/sequence envelopes, and recovery snapshot
integration.
- Add exact-version fixtures and focused tests for the event/session projector
seam without wiring Host API or Renderer consumers owned by later tickets.
## Intent And Constraints
- Follow planner task `20260822-pi-runtime-spec-b6e2c9a4`, ticket `PI-060`, and
Spec sections 10, 11, and 18.
- Keep Pi wire event, message, and entry types inside Electron Main. Product
callers consume only the PI-010 `ConversationSnapshot` / patch contracts.
- Preserve stable live UI IDs during durable entry reconciliation; never use a
timestamp or array position as identity.
- Treat only `agent_settled` as authoritative idle. `agent_end`, compaction
retry, and queue continuation must not release the run early.
- Recover only the target Conversation, hydrate the new generation, and never
replay an uncertain prompt or alter an unreadable session file.
- Real external Provider verification remains Explicitly Waived / Accepted
Risk with `realTurnVerified=false`; macOS remains deferred to `PI-150`.
- Keep the implementation surgical: no Host API/Renderer wiring, OpenCode
compatibility layer, feature flag, or unrelated refactor.
## Project Context Loaded
- Concurrent Task Gate: Passed. The task owns feature worktree
`D:\Datas\OthersProjects\makelore-pi-event-projector-91c6a7e4`, branch
`codex/20260823-pi-event-projector-91c6a7e4-pi-event-projector`, at base
`e79aeffffab16c4c5570971e24d1a20997be681d`.
- Planning Gate: Passed after reading the required project positioning,
integrated state, decisions, architecture, domain, evidence, reflection,
commitments, stale-items, planner, PI-050, and all registered peer scopes.
- The canonical positioning file is still a placeholder and integrated state
predates the Pi feature chain, so the task-scoped cutover Spec/tickets and
completed PI task records are authoritative for this implementation.
- No peer owns the PI event/session projector. Older undefined OpenCode partner
model tasks do not own projector behavior and this task does not change model
switching semantics; no semantic conflict was found.
- Likely modules: `electron/coding-runtime/contracts.ts`,
`electron/coding-runtime/conversation-reducer.ts`,
`electron/coding-runtime/pi/runtime.ts`, new Main-private projector modules,
and focused tests/fixtures.
- Unknowns to resolve from source before implementation: exact Pi 0.84.2 live
event and persisted-entry shapes, and the smallest existing PI-050 generation
replacement seam. These are code/fixture questions, not product decisions.
## Plan
1. Inspect PI-010/PI-050 contracts and exact Pi event/entry shapes; fix the
projector seam.
2. Use vertical red-green slices for live event projection.
3. Use vertical red-green slices for active-branch hydration, reconciliation,
generation/gap handling, and recover integration.
4. Run focused and full repository verification, then synchronize evidence to
the planner task for independent review.
## Outcome
- Added a Main-private `PiEventProjector` for exact Pi 0.84.2 live RPC
shapes. It projects stable message/content-index streams, cumulative tool
output, authoritative `toolResult`, retry/turn/compaction boundaries, queue,
interaction, usage, context, and authoritative `agent_settled` idle patches.
- Added a pure `projectPiSessionSnapshot` seam for authoritative
`entries + leafId` traversal, latest-compaction retained-tail semantics,
abandoned-branch exclusion, tool/result reconstruction, large-image
attachment projection, context recalculation state, and stable live-to-
durable ID reconciliation.
- Integrated per-Conversation serial projection into `PiConversationRuntime`.
Initial prepare/fork hydrates persisted state, `agent_end` creates a
non-idle checkpoint, `agent_settled` creates the final idle snapshot, and
worker replacement/recovery reopens and hydrates only the target generation.
- Added recoverable fail-closed handling for unreadable session trees. The
last good nodes remain in memory, no source-session write occurs, sibling
Conversations remain unchanged, and a later corrected recovery succeeds.
- Extended the product contract/reducer only for the already-modeled turn
boundary patch and `context.recalculating`; no Pi wire type escaped Main.
- Added a named exact-version fixture for
`@earendil-works/pi-coding-agent@0.84.2` and focused regression coverage for
live/cold equivalence, compaction/retry/queue settling, tool partials,
attachment references, target-only recovery, and corrupt sessions.
## Verification
- `corepack pnpm run lint:check` — passed with 0 errors; the repository's 6
pre-existing React warnings remain outside this task.
- `corepack pnpm run typecheck` — passed.
- `corepack pnpm test` — passed, 195 files / 2181 tests.
- `corepack pnpm run build:vite` — passed for Renderer, Electron Main,
Preload, and release utility outputs; existing chunk-size/dynamic-import
warnings remain.
- `corepack pnpm run test:electron:windows` — passed, 1 file / 3 tests.
- `corepack pnpm run probe:pi-runtime` — command passed against staged Pi
0.84.2 production closure, local session/reopen/isolation probes, and ready
budgets. Probe result remains `partial-pass / incomplete` because
`realTurnVerified=false`; real Provider validation is Explicitly Waived /
Accepted Risk. macOS execution remains deferred to PI-150 and is not Pass.
- Focused projector/runtime suite — passed, including all 15 `pi-*.test.ts`
files / 78 tests after an isolated Windows temporary-file `rename EPERM`
was rerun successfully; the later full suite passed without recurrence.
- `git diff --check` — passed.
## Follow-ups
- PI-070 owns registered extension tool-detail schemas and interaction response
behavior; PI-060 deliberately keeps unknown/custom payloads hidden or in
bounded metadata-only diagnostics.
- Later Host/runtime assembly must supply the `projectImage` persistence hook
so live/session image bytes become product attachment IDs in production.
- PI-150 owns the deferred macOS matrix. Real Provider compatibility,
concurrency, credential isolation, and protocol behavior remain accepted
unverified risks under the explicit user waiver.
## Promotion Candidates
- None. The durable rules implemented here are already canonical in the Pi
cutover Spec and PI-060 ticket; no duplicate architectural prose is needed.