New lightweight command for tasks too small to justify planning overhead:
typo fixes, config changes, forgotten commits, simple additions.
- Runs inline in current context (no subagent spawn)
- No PLAN.md or SUMMARY.md generated
- Scope guard: redirects to /gsd:quick if task needs >3 file edits
- Atomic commit with conventional commit format
- Logs to STATE.md quick tasks table if present
Complements /gsd:quick (which spawns planner+executor) for cases where
the planning overhead exceeds the actual work.
Closes#609