docs: implementation plan (TTY precedents folded in); task decomposition (17 tasks)

Plan updated with the alknet-tty findings: the drainer pattern
(single ordered writer) makes outbound chunk-boundary parsing sound;
TestStdinSink's try_send→Full→Pending is the inbound backpressure
precedent; OQ-01(a) now cites the reference.

Task graph (taskgraph-validated, 17 tasks, 6 generations, no cycles):
- tasks/server/: core-types, auth, healthz-decoy, adapter
- tasks/gateway/: dispatch, routes, publish
- tasks/websocket/: byte-adapter (research POC), upgrade-session, overlay-ops
- tasks/adapters/: from-openapi, from-jsonschema, to-openapi, from-wss, mcp
- tasks/client/: http-host
- tasks/infra/: integration-suite (phase 4)

Critical path runs through server core → adapter → WS session →
overlay tests → integration suite. High-risk tasks are the three WS
tasks, de-risked by the ws-byte-adapter POC blocking upgrade-session.

tasks/server/auth.md

@@ -0,0 +1,42 @@
+---
+id: server-auth
+name: Bearer auth middleware and identity extraction
+status: pending
+depends_on: [server-core-types]
+scope: narrow
+risk: low
+impact: component
+level: implementation
+tags: [server, phase-1]
+---
+
+## Description
+
+Port `bearer_auth_middleware` and `extract_bearer_identity` +
+`ResolvedIdentity` from
+`/workspace/@alkdev/alknet/crates/alknet-http/src/server/auth.rs`.
+Resolution via `IdentityProvider::resolve_from_token(&AuthToken { raw })
+` (alkcall::core::auth). Middleware behavior: no/invalid token →
+identity None (routes decide 401 vs anonymous); token present →
+ResolvedIdentity(Some(identity)). Unit tests over the middleware with a
+static identity provider.
+
+## Acceptance Criteria
+
+- [ ] Middleware ports with tests (missing header, malformed, valid token, unknown token)
+- [ ] `set_identity` observability path documented for the WS route's use
+- [ ] No env-var reads anywhere (no-env-vars invariant)
+- [ ] `cargo test` passes
+
+## References
+
+- docs/architecture/http-server.md (§Auth)
+- docs/architecture/decisions/004-auth-as-shared-core.md
+
+## Notes
+
+> Agent fills during implementation.
+
+## Summary
+
+> Agent fills on completion.