refactor(doctor): consolidate maintenance commands + improve daemon startup
Consolidate clean, repair-deps, validate into bd doctor:
- Add validation checks to doctor (merge artifacts, orphaned deps, duplicates, test pollution, git conflicts)
- Add auto-fix for merge artifacts and orphaned dependencies
- Delete obsolete command files: clean.go, repair_deps.go, validate.go
- Delete orphaned test files: clean_security_test.go, validate_test.go
Improve daemon startup performance:
- Add fast-fail detection when daemon crashed (check lock before retrying)
- Reduce graceful shutdown timeout from 5s to 1s
- Skip daemon connection for root command (just shows help)
- Extract shutdown timeout as constants (daemonShutdownTimeout, daemonShutdownPollInterval)
Other changes:
- Move rename-prefix command to Maintenance group in help
- Fix Makefile to inject git commit hash via ldflags
New files:
- cmd/bd/doctor/validation.go (5 check functions)
- cmd/bd/doctor/fix/validation.go (2 fix functions)
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