docs: add strict chat output policy (five-line max, no diffs) to AGENTS.md and SeedPrompt.md; log in devlog

AGENTS.md

@@ -46,3 +46,10 @@ Scope: Applies to the entire repository unless overridden by a deeper AGENTS.md.
 - Incremental artifacts: start a new `NN-<subject>.md` per round to avoid long single files.
 - Status style: one-line updates before tool calls; rely on devlog for detail.
 - Avoid re-reading large files in chat; reference exact file paths and sections instead.
+
+## Chat Output Policy
+- Default message: `Updated <filepath>. Read/edit and let me know.`
+- Keep chat to five lines or fewer.
+- Do not paste diffs or file contents in chat; write to files instead.
+- Aggregate multiple updates in a short bulleted list of filepaths.
+- Push detailed reasoning/status to `docs/devlog/` and reference it when needed.

SeedPrompt.md

@@ -68,3 +68,10 @@ Commit/push everything in the repo now before we get started on the project.
 - Summarize for the model in `.llm.md` companions; keep human-readable detail in the primary `.md`.
 - Do not paste large content into chat; write to files and reference paths.
 - Prefer starting new numbered files per round to keep each doc short.
+
+### Chat Output Policy
+
+- Default chat line: `Updated <filepath>. Read/edit and let me know.`
+- Limit chat to five lines or fewer; avoid explanations in chat.
+- Never paste diffs or large content in chat; commit to files and reference paths.
+- Log detail in `docs/devlog/` and keep the chat terminal clean.

docs/devlog/DEVLOG_LLM.md

@@ -46,3 +46,10 @@ This log is concise and structured for quick machine parsing and summarization.
   - Removed old `devlog/` files
 - next:
   - Continue detailed logging here; keep chat terse
+
+## 2025-09-17T15:10Z
+- context: Strict chat output policy adopted
+- actions:
+  - Added Chat Output Policy to AGENTS.md and SeedPrompt.md (five-line max; default message format; no diffs in chat)
+- next:
+  - Use filesystem-first workflow; keep chat to update notices