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openspec/archive/2026-05-05-network-plugin-session/tasks.md
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openspec/archive/2026-05-05-network-plugin-session/tasks.md
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# Tasks — network-plugin-session
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> Blocked on: `network-core`, `network-plugin-topology`.
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## 1. Scaffold
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- [x] 1.1 `packages/network/network-plugin-session/` with `package.json` (`@suaveplan/network-plugin-session@0.0.0`), `tsconfig.json`, `vitest.config.ts`, `README.md`.
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- [x] 1.2 Workspace deps: `@suaveplan/network`, `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, `@suaveplan/fsm`, `@suaveplan/governance` (or inline election), `@suaveplan/timing`, `@opentelemetry/api`, `zod`.
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- [x] 1.3 `sideEffects: false`.
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## 2. Types
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- [x] 2.1 `src/types/session.types.ts` — `Session`, `SessionId`, `SessionConfig`, `SessionRules`, `SessionState`.
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- [x] 2.2 `src/types/tree.types.ts` — `SessionTree`, `SessionNode`, `SessionPath`.
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- [x] 2.3 `src/types/message.types.ts` — `SessionMessage`, `SessionScope`, `SessionEnvelope`.
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- [x] 2.4 `src/types/transition.types.ts` — `SessionTransition`, `TransitionType`, `SessionSnapshot`.
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- [x] 2.5 `src/error-codes.ts` — `defineCodes("NET_SESSION", [...])`.
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## 3. Session tree
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- [x] 3.1 `src/tree/session-tree.ts` — `SessionTree` maintains parent/child relationships.
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- [x] 3.2 Root session is created automatically when plugin starts.
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- [x] 3.3 `createSession(parentId, config)`, `destroySession(sessionId)`.
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- [x] 3.4 `getSessionPath(sessionId)` returns ancestor chain.
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- [x] 3.5 Prevents cycles.
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## 4. Session manager
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- [x] 4.1 `src/session/session-manager.ts` — `SessionManager`.
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- [x] 4.2 `join(sessionId, peerId)` — adds peer to session, removes from previous leaf.
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- [x] 4.3 `leave(sessionId, peerId)` — removes peer, moves to parent session.
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- [x] 4.4 `move(peerId, fromSessionId, toSessionId)` — atomic leave + join with snapshot.
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- [x] 4.5 Emits `session:joined`, `session:left`, `session:moved` on `NetworkBus`.
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## 5. Session router
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- [x] 5.1 `src/router/session-router.ts` — `SessionRouter`.
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- [x] 5.2 Intercepts `send(targetId, envelope)` from `NetworkNode`.
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- [x] 5.3 If envelope has `sessionId` header, delivers only to peers in that session or its descendants.
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- [x] 5.4 If envelope has `scope: 'parent'`, delivers only to parent session host.
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- [x] 5.5 If envelope has `scope: 'broadcast'`, delivers to all peers in session branch.
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- [x] 5.6 If no session scope, defaults to peer's current leaf session.
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## 6. Session host election
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- [x] 6.1 `src/election/session-host-election.ts` — `SessionHostElection`.
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- [x] 6.2 Uses same scoring as governance (latency, uptime, reputation) but scoped to session peers.
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- [x] 6.3 Election triggered on host leave or periodic health check.
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- [x] 6.4 Emits `session:host-changed` on bus.
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## 7. Session transition manager
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- [x] 7.1 `src/transition/session-transition-manager.ts` — `SessionTransitionManager`.
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- [x] 7.2 On `join`: requests state snapshot from session host, applies it locally.
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- [x] 7.3 On `leave`: emits `session:peer-left` so host can clean up peer state.
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- [x] 7.4 On `move`: creates forwarding tunnel from old host to new host for in-flight messages.
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- [x] 7.5 Uses `@suaveplan/fsm` for transition states: `idle → requesting → syncing → active → leaving → complete`.
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## 8. Parent state bridge
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- [x] 8.1 `src/bridge/parent-state-bridge.ts` — `ParentStateBridge`.
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- [x] 8.2 Configurable read-only keys replicated from parent to child sessions.
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- [x] 8.3 Examples: `worldTime`, `weather`, `globalEvent`.
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- [x] 8.4 Child session peers receive parent state updates but cannot send to parent.
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## 9. Session capacity enforcer
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- [x] 9.1 `src/capacity/session-capacity-enforcer.ts` — `SessionCapacityEnforcer`.
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- [x] 9.2 Rejects `join` when `peers.length >= capacity`.
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- [x] 9.3 Emits `session:capacity-exceeded` on bus.
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- [x] 9.4 Optional: triggers `session:split-requested` when capacity exceeded and parent allows splitting.
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## 10. Session registry
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- [x] 10.1 `src/registry/session-registry.ts` — `SessionRegistry`.
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- [x] 10.2 Tracks all sessions: `id`, `hostId`, `peerCount`, `capacity`, `depth`.
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- [x] 10.3 Syncs to `NetworkBus` for mesh-wide discovery.
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- [x] 10.4 Consumed by assignment engine for placing new peers.
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## 11. Plugin wrapper
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- [x] 11.1 `src/plugin/session-plugin.ts` — `SessionPlugin` implements `NetworkPlugin`.
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- [x] 11.2 Installs session manager, router, election, transition, bridge, capacity, registry on `install()`.
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- [x] 11.3 Intercepts `NetworkNode.send()` to inject session routing.
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## 12. Spec
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- [x] 12.1 Update `openspec/specs/network-session/spec.md` with `NET-SESS-01` through `NET-SESS-12`.
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## 13. Conformance tests
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- [x] 13.1 `src/session/session.spec-conformance.test.ts` — create, destroy, join, leave, move.
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- [x] 13.2 `src/router/router.spec-conformance.test.ts` — scope filtering, upward routing, broadcast.
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- [x] 13.3 `src/election/election.spec-conformance.test.ts` — per-session host, independence from mesh host.
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- [x] 13.4 `src/transition/transition.spec-conformance.test.ts` — snapshot transfer, forwarding tunnel.
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- [x] 13.5 `src/capacity/capacity.spec-conformance.test.ts` — enforcement, rejection, split.
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- [x] 13.6 `src/bridge/bridge.spec-conformance.test.ts` — parent state replication, read-only.
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- [x] 13.7 `src/registry/session-registry.spec-conformance.test.ts` — tree tracking, peer counts.
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- [x] 13.8 `src/error-codes.spec-conformance.test.ts` — frozen registry.
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## 14. Verify
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- [x] 14.1 `bunx turbo lint typecheck test --filter=@suaveplan/network-plugin-session` green.
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- [x] 14.2 `bunx turbo test:coverage --filter=@suaveplan/network-plugin-session` 100/100/100/100.
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- [x] 14.3 `bun scripts/openspec-conformance.ts @suaveplan/network-plugin-session` PASS.
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---
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## Audit Note (2026-05-05)
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**Status**: SHIPPED — every section delivered at full quality (100/100/100/100 coverage, 100% docs, openspec-conformance PASS, 90 tests across 11 files). One scope adjustment from the original spec:
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- The `CYCLE_DETECTED` error code is omitted because the public `createSession` API rejects duplicate ids (`SESSION_ALREADY_EXISTS`) and missing parents (`PARENT_NOT_FOUND`) before any cycle-forming assignment can land. The remaining six `NET_SESSION` codes cover every reachable failure path.
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The shipped surface (`SessionTree`, `SessionManager`, `SessionRouter`, `SessionHostElection`, `SessionTransitionManager`, `ParentStateBridge`, `SessionCapacityEnforcer`, `SessionRegistry`, `SessionPlugin`) covers `NET-SESS-01` through `NET-SESS-12` from the network-session spec.
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