feat: add global system prompt and seed AGENTS templates; update proposal to include meta/ and prompts/global/; add project AGENTS template\n\nchore: update AGENTS.md and dev logs; encode governance/propagation rule

templates/project/_shared/AGENTS.md

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+# AGENTS.md — Project Template
+
+Scope: Applies to the entire project repository unless overridden by a deeper AGENTS.md.
+
+This file is copied by scaffolding into new projects. Edit to suit the project while keeping the one-way collaboration flow and file-first practices.
+
+## Collaboration Artifacts
+- Root: `collab/`
+- Subdirectories: `collab/questions/`, `collab/proposals/`, `collab/plan/`
+- Naming per round: `NN-<subject>.md` (+ `.llm.md` sibling)
+- One-way sequence: Questions → Proposal → Plan → Implement; no backsteps after approval
+- Agent reads `.llm.md`; humans edit `.md`. Agent writes both siblings.
+
+## Logs and Docs
+- `docs/devlog/DEVLOG_LLM.md` and `docs/devlog/DEVLOG_HUMAN.md` — update each meaningful change.
+- `docs/` for feature docs and ADRs.
+- Keep `README.md` current.
+
+## Chat Output Policy
+- Default: `Updated <filepath>. Read/edit and let me know.`
+- Keep chat ≤5 lines; no diffs; announce only collab file changes; log details in DevLog.
+
+## Coding, Tests, and Git
+- Minimal, focused changes; add tests with features; consistent style.
+- Conventional Commits; branch `main`; tags `YYYY-MM-DD-HHMM` when warranted.
+
+## Tooling and Safety
+- File-first workflow; prefer `rg`; read files in ≤250-line chunks.
+- Respect sandbox/approvals; avoid destructive actions without confirmation.
+- Provide brief preambles before grouped/long-running commands.
+
+## Prompts/Config (if applicable)
+- YAML+yq; precedence `CLI > env > project > mode > global`.
+- Prompt order: Global system → Mode system overlay (optional) → Mode rules → Project narrative.
+- Outputs: `<project>/runs/<timestamp>/...`; require `--force` for overwrites; never `git push`.
+
+## Governance and Propagation
+- When you adopt a reusable, non-project-specific practice, reflect it in your project’s system prompt and AGENTS.md to keep them aligned. Log such changes in `docs/devlog/`.