docs: update task status to completed for call-envelope-integration

tasks/call-protocol/001-call-envelope-integration.md

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+---
+id: call-envelope-integration
+name: Update PendingRequestMap and CallHandler for ResponseEnvelope
+status: completed
+depends_on: [response-envelope-tests]
+scope: broad
+risk: medium
+impact: project
+level: implementation
+---
+
+## Description
+
+Update `src/call.ts` to integrate `ResponseEnvelope` throughout the call protocol. This covers all changes documented in call-protocol.md and api-surface.md's "Source vs. Spec Drift" sections for ADR-005.
+
+Changes needed:
+
+### `CallEventSchema["call.responded"]`
+- Change `output` from `Type.Unknown()` to `ResponseEnvelopeSchema`
+
+### `PendingRequestMap.respond()`
+- Add `isResponseEnvelope()` guard — throws if `output` is not a valid envelope
+- This enforces the invariant that all call protocol responses carry source metadata
+
+### `PendingRequestMap.call()`
+- Return type changes from `Promise<unknown>` to `Promise<ResponseEnvelope>`
+- Resolution: the `call.responded` subscription handler resolves with the `ResponseEnvelope` from `output` field (which is already validated by `respond()`)
+
+### `CallHandler`
+- **Handler model change**: Handler returns a value; `CallHandler` wraps and publishes. Handler does NOT publish `call.responded` itself.
+- Capture handler return value
+- Apply shared result pipeline:
+  1. Detect: `isResponseEnvelope(result)` → pass through
+  2. Wrap: `localEnvelope(result, operationId)`
+  3. Normalize: `Value.Cast(spec.outputSchema, envelope.data)` when `outputSchema !== Type.Unknown()`
+  4. Validate: `collectErrors` on `envelope.data` — warning-only
+- Publish `call.responded` via `callMap.respond(requestId, envelope)`
+- On handler exception: `mapError()` converts to `CallError`, publish `call.error`
+
+**Note**: Access control in `CallHandler` stays as-is (checking `identity` and `checkAccess`). ADR-006's change to make `CallHandler` call `execute()` is a separate task.
+
+## Acceptance Criteria
+
+- [x] `CallEventSchema["call.responded"].output` is `ResponseEnvelopeSchema`
+- [x] `PendingRequestMap.respond()` validates `output` with `isResponseEnvelope()`, throws on raw values
+- [x] `PendingRequestMap.call()` return type is `Promise<ResponseEnvelope>`
+- [x] `CallHandler` captures handler return value instead of discarding it
+- [x] `CallHandler` applies result pipeline: detect → wrap → normalize → validate
+- [x] `CallHandler` publishes `call.responded` via `callMap.respond()` with the envelope
+- [x] `CallHandler` on handler exception publishes `call.error` (not re-throws)
+- [x] Adapter handlers (pre-built envelopes via `mcpEnvelope`/`httpEnvelope`) pass through via `isResponseEnvelope()`
+- [x] Existing `call.test.ts` tests updated for new return types and behavior
+- [x] New tests for: envelope validation in `respond()`, envelope wrapping in `CallHandler`, envelope passthrough, Value.Cast normalization
+- [x] `npm run build` passes
+- [x] `npm run lint` passes
+- [x] `npm test` passes
+
+## References
+
+- docs/architecture/call-protocol.md § Source vs. Spec Drift (ADR-005 items)
+- docs/architecture/api-surface.md § Source vs. Spec Drift (ADR-005 items)
+- docs/architecture/response-envelopes.md § CallHandler, § PendingRequestMap
+- src/call.ts
+
+## Notes
+
+`CallHandlerConfig` changed from `{ registry, eventTarget? }` to `{ registry, callMap? }` to support publishing `call.responded` via `callMap.respond()`. When `callMap` is not provided, errors are thrown directly (backward-compatible for direct use without the call protocol).
+
+`Value.Cast` in TypeBox does not strip excess properties from objects — it only fills defaults and upcasts values. The test was updated to verify default-filling behavior rather than property stripping.
+
+## Summary
+
+Integrated ResponseEnvelope throughout the call protocol in `src/call.ts`.
+
+- Modified: `src/call.ts` (52 lines changed)
+  - `CallEventSchema["call.responded"].output` → `ResponseEnvelopeSchema`
+  - `PendingRequest.call()` → `Promise<ResponseEnvelope>`
+  - `PendingRequestMap.respond()` → validates with `isResponseEnvelope()`, throws on raw values
+  - `CallHandler` → captures return value, applies detect→wrap→normalize→validate pipeline, publishes via `callMap`
+  - `CallHandlerConfig` → `{ registry, callMap? }` replacing `eventTarget?`
+  - Added imports: `KindGuard`, `Value`, `collectErrors`, `formatValueErrors`, `ResponseEnvelopeSchema`, `isResponseEnvelope`, `localEnvelope`
+- Modified: `test/call.test.ts` (547 lines added)
+  - Updated existing tests to pass `ResponseEnvelope` to `respond()`
+  - Added 23 new tests: envelope validation in `respond()`, envelope wrapping in `CallHandler`, envelope passthrough (mcp/http), `Value.Cast` normalization, error publishing, and no-callMap fallback behavior
+- All 189 tests passing
+- Build and lint passing