refactor: remove /code command and code-agent

fix: exclude all commands from skill assignment, require CHECK on all tracks

chore: clean up stale whiteboarding docs and fix worktree plan copy

docs: update stale references to old pipeline phases and deleted agents

chore: bump version to 4.4.0

refactor: consolidate build pipeline — merge pre-gate + implementation agents into build-agent, add clarify skill, update code command

refactor(whiteboarding): rewrite as thin router, Standard/Full via Skill()

feat(whiteboarding): extract Standard/Full pipeline to whiteboarding-planning skill

plan: whiteboarding-split

fix(whiteboarding): quick track classification based on user intent, not implementation terms

feat(whiteboarding): quick track default + code-standards doc

feat(building): adaptive gate policy replaces uniform per-phase verification

feat: add code-patterns.md generation and staleness detection to whiteboarding

refactor: replace hardcoded skill audit with dynamic skill discovery

feat: add ca-architecture-boundaries skill for system-level design