Fix opencode control-session reuse for monitor layout restarts

[proboscis]

Summary

• harden opencode control-session reuse in daemon by retrying stored-session lookup with backoff before giving up
• normalize directory matching in findBestOpenCodeControlSession (clean + symlink resolution fallback) to handle trailing slash/symlink differences
• extend recovery flow to try project-scoped session listing first, then unscoped listing with title-based fallback (orch-control)
• add explicit reuse-failure logging paths with concrete reasons for troubleshooting
• add/extend daemon tests to cover retries, normalized-path reuse, title fallback recovery, and fresh-session creation when no stored control session exists

Acceptance Criteria Evidence

1) orch-monitor --new preserves control session history when server still running

Verified via daemon reuse and recovery tests:

go test ./internal/daemon -run "TestGetOrCreateOpenCodeControlSessionReusesExisting|TestGetOrCreateOpenCodeControlSessionRetriesStoredLookup|TestGetOrCreateOpenCodeControlSessionRecoversAfterServerRestart" -v

All pass and show stored session is reused/recovered (no new session creation in those paths).

2) Session reuse works with trailing slash/symlink path differences

Verified via normalized path tests:

go test ./internal/daemon -run "TestGetOrCreateOpenCodeControlSessionRecoversWithNormalizedDirectory|TestFindBestOpenCodeControlSessionNormalizesPathComparison" -v

Both pass.

3) --new-control-agent still creates a fresh session

--new-control-agent clears .orch/control-session.json; daemon behavior when no stored session now verified by:

go test ./internal/daemon -run "TestGetOrCreateOpenCodeControlSessionCreatesWhenNoStoredSession" -v

Passes and confirms immediate fresh session creation.

4) Daemon logs include reuse-failure reasons

Verified via:

go test ./internal/daemon -run "TestGetOrCreateOpenCodeControlSessionLogsReuseFailureReason" -v

Passes and asserts log output includes explicit failure reasons for reuse and recovery listing failures.

5) Add test for path normalization in findBestOpenCodeControlSession

Added and verified:

go test ./internal/daemon -run "TestFindBestOpenCodeControlSessionNormalizesPathComparison" -v

Passes.

Validation Run

• go test ./internal/daemon -run "Test(GetOrCreateOpenCodeControlSession|FindBestOpenCodeControlSession)" ✅
• go build ./... ✅
• make lint ✅
• go test ./... ❌ (pre-existing unrelated failure in internal/cli):
  • TestApplyConfigDefaultsFallbacks fails with invalid config schema ... config.yaml: EOF

Refs: orch-440