feat: workflow intelligence, quality loop, completion promises, parallel teams

Sprint 1 — Workflow Intelligence (A1-A3):
- Conditional escalation: fast→standard on 2+ CRITICALs
- Guardian fast-path: skip remaining reviewers on clean pass
- Confidence-triggered escalation: pause/upgrade/probe on low scores

Sprint 2 — Quality Loop (B1-B2, B5-B6):
- Maker self-review checklist before submitting to Check phase
- Proposal diff ("What Changed") on cycle 2+ revisions
- Convergence detection: escalate to user if same finding persists 2 cycles
- Cross-archetype dedup: merge duplicate findings from different reviewers

Sprint 3 — Completion & Verification (B3-B4):
- Completion promise: user-defined done criteria checked in Act phase
- Post-merge verification: run tests on main, auto-revert on failure

Sprint 4 — Parallel & Scale (C1-C4):
- Parallel team orchestration: 2-3 independent teams with merge gate
- Task dependency graph in autonomous queue format
- Auto-resume on interruption via .archeflow/state.json
- Budget-aware scheduling with automatic workflow downgrade

skills/plan-phase/SKILL.md

@@ -77,6 +77,9 @@ When the Creator receives structured feedback from a prior cycle, the proposal m
 ```markdown
 ## Proposal: <task> (Revision — Cycle N)
 
+### What Changed (vs. prior proposal)
+- <brief delta: what was added, removed, or redesigned>
+
 ### Prior Feedback Response
 | Issue | Source | Action | Rationale |
 |-------|--------|--------|-----------|