Audit public agent guides against the ecosystem standard #58

Review every tracked public AGENTS.md against the agent-guide standard being completed in
ml4t/ecosystem#31.

The root guide must match the current package responsibility, source layout, public imports,
compatibility constraints, safety rules, and repository quality commands. Each nested guide must be
necessary for its directory, identify the subsystem in its title, state only narrower constraints,
and avoid copied root material, private sidecar state, current work, and volatile counts. Do not add
empty files where no nested guide is needed. Public repositories must not track CLAUDE.md,
.claude/, .codex/, or .workspace/.

Acceptance criteria:

• compare the guides with current source exports, documentation, and workflow commands;
• update, consolidate, or remove stale guides without changing runtime behavior;
• run the repository's focused documentation or instruction checks and full documented gates;
• run uv run ml4t-ecosystem audit-workspaces from the ecosystem checkout; and
• close this issue through a focused pull request, or record the checked evidence if no edit is
  required.

Tracked by the library's issue in the ecosystem closure milestone.