Infer workplan prefixes from on-disk filenames instead of first-token
derivation, add a frontmatter normalization script, and wire Make targets
for dirty-repo sweeps.
Introduce credential-routing.template for Codex, Claude Code, Grok, and
llm-connect agents. Wire into agents-codex.template and claude-md.template.
Add propagate_credential_routing.py for surgical rollout without clobbering
repo-specific AGENTS.md extensions (REPO-AGENTS-EXTENSIONS marker).
