governance: add planning/architecture rule (plan ahead, module map, avoid refactors); propagate to system prompts, AGENTS templates, proposal, and plan

collab/proposals/01-codexhelper.md

@@ -40,7 +40,8 @@ Purpose: Implement a bash wrapper (CodexHelper) around codex-cli with “modes
 - `meta/{AGENTS.seed.md, AGENTS.seed.llm.md}` (seed AGENTS templates for bootstrap/reference)
 - Governance/Propagation: maintain global norms in `prompts/global/` and seed AGENTS templates; reflect such changes in proposal/plan for scaffolding.
 - TDD Governance: enforce test-driven development; require unit/integration tests for all features here and in generated projects.
- - Zero Technical Debt: safety first; always production-ready; no deferring tests/docs/refactors; leverage sub-agents when needed.
+- Zero Technical Debt: safety first; always production-ready; no deferring tests/docs/refactors; leverage sub-agents when needed.
+ - Planning/Architecture Governance: plan ahead via Questions→Proposal→Plan; keep a global architecture/module map; implement module-by-module; avoid refactors except when assumptions change and plans/docs are updated.
 
 ## Project Layout (generated)
 - `AGENTS.md` (from `templates/project/_shared/AGENTS.md`)
@@ -66,6 +67,7 @@ Purpose: Implement a bash wrapper (CodexHelper) around codex-cli with “modes
   - Governance/Propagation: non-project-specific rules are folded back into global/system and templates; changes logged.
   - TDD: tests are written first and required for acceptance.
   - Zero Debt: no pending TODOs/deferrals; docs updated alongside code; production-ready gate on each change.
+  - Planning/Architecture: architecture/module map documented; implementations follow plan without unplanned refactors.
 
 ## Safety
 - Guardrails: