Sync AGENTS.md, CLAUDE.md, and .claude/rules from updated project_rules
templates: workplan-first session protocol, legacy terminology footnote,
and GET /workplans/ examples.
Inline ops-warden credential routing guidance in AGENTS.md and mirror it
for Claude Code under .claude/rules/. Add IDENTITY-WP-0003 to backfill the
research corpus and refine the conceptual model against scenario tests.