Add BD_SOCKET environment variable support to override daemon socket path,
enabling parallel test isolation via t.TempDir() + t.Setenv().
Changes:
- getSocketPath() checks BD_SOCKET first, falls back to dbPath-derived path
- getSocketPathForPID() checks BD_SOCKET first (for consistency)
- Add daemon_socket_test.go with isolation pattern examples
This is a minimal tracer bullet to validate the approach before
expanding to full test isolation infrastructure.
Backward compatible: default behavior unchanged without env var set.
Global daemon support has been deprecated for most of the project's
lifetime. This change removes the dead code entirely:
- Remove --global and --migrate-to-global daemon flags
- Remove runGlobalDaemon() and migrateToGlobalDaemon() functions
- Remove shouldUseGlobalDaemon() and getGlobalBeadsDir() functions
- Simplify functions that had global bool parameters
- Remove warning about old global socket in getSocketPath()
This reduces code complexity and removes 238 net lines of unused code.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
