chore: code health review - test fix and error comments (bd-9g1z, bd-ork0)

- Remove TestFindJSONLPathDefault from .test-skip (now passes)
- Add explanatory comments to 24 ignored error locations in cmd/bd:
  - Cobra flag methods (MarkHidden, MarkRequired, MarkDeprecated)
  - Best-effort cleanup/close operations
  - Process signaling operations

Part of code health review epic bd-tggf.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/reset.go

@@ -322,7 +322,7 @@ func stopDaemonQuiet(pidFile string) {
 		return
 	}
 
-	_ = sendStopSignal(process)
+	_ = sendStopSignal(process) // Best-effort graceful stop
 
 	// Wait for daemon to stop gracefully
 	for i := 0; i < daemonShutdownAttempts; i++ {
@@ -333,7 +333,7 @@ func stopDaemonQuiet(pidFile string) {
 	}
 
 	// Force kill if still running
-	_ = process.Kill()
+	_ = process.Kill() // Best-effort force kill, process may have already exited
 }
 
 func removeGitattributesEntry() error {