docs(agents): add AGENTS.md fleet baseline

AGENTS.md

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+# AGENTS.md
+
+Guidance for agents working in this repository.
+
+## Session start (continuity ritual)
+
+- Every new session/round: read & understand the team knowledge rooms before
+  doing any work.
+- Save every decision or important outcome back to the responsible room during
+  or at the end of the session.
+- Handing over mid-task: leave a `[HANDOFF]` entry (current state, next step,
+  blockers).
+
+## Workflow summary
+
+Issue → branch from develop → code + pre-commit checks → push → PR to develop
+(`## What` / `## Why` / `## Testing`, English) → CI green + review verdict →
+merge (squash; the PR title becomes the commit message) → cleanup → release
+(bump + CHANGELOG + tag). 1 issue = 1 branch = 1 PR.
+
+## Commits & PRs
+
+- Conventional Commits; the PR title becomes the squash message.
+- Keep commit messages, PR titles/bodies and comments clean: no third-party
+  trailers, no generated-with lines (ecosystem message standard, enforced by
+  tooling).