Please deep think / ultrathink as this is a complex task.

plan-3-v3-architect

Generate a lean, domain-aware implementation plan with phases, task tables, acceptance criteria, AND self-validating fail-fast gates baked in. Replaces both the legacy plan-3-v2-architect and the bolt-on plan-4-v2-complete-the-plan validator — gates run inline and the plan emits in one of two states:

• **Status**: READY — all gates passed; plan is consumable by /plan-5.
• **Status**: DRAFT — UNRESOLVED GAPS — one or more gates failed. The plan is still written (the user has context to fix) but is annotated with inline ⚠️ GAP: <reason> markers at each violation site, plus a final ## Unresolved Gaps summary table.

The plan is always written. The user is never blocked from seeing it. But the status header + inline gap markers + summary table make it impossible to silently consume a broken plan downstream.

🚫 NO TIME ESTIMATES

Use Complexity Score (CS 1-5) only:

• CS-1 (trivial): 0-2 points | CS-2 (small): 3-4 | CS-3 (medium): 5-7 | CS-4 (large): 8-9 | CS-5 (epic): 10-12
• Factors (each 0-2): Surface Area, Integration, Data/State, Novelty, Non-Functional, Testing/Rollout