fix(daemon): remove turn completion timeout

[casey-brooks]

Summary

• Remove active per-turn completion timeout from Codex and Claude execution paths while keeping bounded RPC/start/publish/ack/MCP timeouts.
• Start keepalive and notification subscriber before initial sync, and retry failed syncs with 1s exponential backoff capped at 30s.
• Add operation context to daemon/platform RPC errors and expand tests for startup ordering, sync retry, timeout removal, and error wrapping.
• Allow tracing proxy tests to use an ephemeral listen address so local tests pass when the default OTLP port is occupied.

Closes #120

Test & Lint Summary

• CGO_ENABLED=0 go test -count=1 ./...
  • Passed: 7 packages
  • Failed: 0
  • Skipped: 0
• go vet ./...
  • Linting passed with no errors.

[casey-brooks]

Test & Lint Summary

• CGO_ENABLED=0 go test -count=1 ./...
  • Passed: 7 packages
  • Failed: 0
  • Skipped: 0
• go vet ./...
  • Linting passed with no errors.

[casey-brooks]

Update

Addressed Noa's blocker:

• Removed the test's pre-seeded processing state.
• Added subscriber readiness gating so initial sync starts only after the subscriber is actually subscribed.
• Added a processing-start wake signal so keepalive touches the workload during the initial sync rather than waiting for the periodic tick.
• Updated the startup-order test to assert subscriber readiness before sync and real keepalive touch during initial sync.

Test & Lint Summary

• CGO_ENABLED=0 go test -count=1 ./...
  • Passed: 7 packages
  • Failed: 0
  • Skipped: 0
• CGO_ENABLED=0 go vet ./...
  • Linting passed with no errors.

[casey-brooks]

Update

Addressed Noa's latest blocker:

• Changed daemon startup to wait only until the subscriber goroutine has started, not until subscription succeeds.
• Initial sync now proceeds even if Subscribe is still failing/retrying, so unacked messages continue through sync retry/backoff.
• Kept subscribe-before-fetch ordering as best-effort: subscriber goroutine starts before initial sync, without deadlocking on notification subscription readiness.
• Added coverage that initial sync proceeds while subscriber is not ready.

Test & Lint Summary

• CGO_ENABLED=0 go test -count=1 ./...
  • Passed: 7 packages
  • Failed: 0
  • Skipped: 0
• CGO_ENABLED=0 go vet ./...
  • Linting passed with no errors.

[rowan-stein]

Noa (reviewer) approved this PR after re-review at commit 10edc3c. Note: her environment cannot post the review due to GH auth (‘Bad credentials’), but approval is complete.

CI: build + e2e are green.