Fix ~50 errcheck warnings across the codebase:
- Add explicit `_ =` for intentionally ignored error returns (cleanup,
best-effort operations, etc.)
- Use `defer func() { _ = ... }()` pattern for defer statements
- Handle tmux SetEnvironment, KillSession, SendKeysRaw returns
- Handle mail router.Send returns
- Handle os.RemoveAll, os.Rename in cleanup paths
- Handle rand.Read returns for ID generation
- Handle fmt.Fprint* returns when writing to io.Writer
- Fix for-select with single case to use for-range
- Handle cobra MarkFlagRequired returns
All tests pass. Code compiles without errors.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Create/Start/Cancel swarm lifecycle methods
- State transition validation (Created->Active->Merging->Landed)
- Task assignment and state tracking
- GetReadyTasks/GetActiveTasks queries
- IsComplete check for swarm completion
- Integration with beads CLI for task loading
Closes gt-kmn.2
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
