Fork deleted 9 ce-* reviewer agents in step (c.1) and dropped the ce-dhh- rails-style skill in step (c.2). Tests and legacy-cleanup registries needed corresponding updates. Tests: - tests/review-skill-contract.test.ts: drop ce-dhh-rails-reviewer, ce-kieran-rails-reviewer, and ce-data-migration-expert from persona list tests. Remove the data-migration-expert unstructured-format test. - tests/legacy-cleanup.test.ts: switch the .agent.md copilot-format test to use agents that still have ce-* versions (correctness-reviewer, maintainability-reviewer) since security-sentinel and performance-oracle are gone. Drop the `lint` case from legacy-only cleanup since the fork re-introduced ce-lint (Python linter) as a current agent. Legacy cleanup registries: - src/utils/legacy-cleanup.ts: add the 9 deleted ce-* agent names to STALE_AGENT_NAMES and ce-dhh-rails-style to STALE_SKILL_DIRS so upgrades from pre-merge installs sweep the old files. - src/data/plugin-legacy-artifacts.ts: mirror the additions in the compound-engineering plugin's historical artifact lists. Frontmatter: - Drop embedded <example>/<commentary> blocks from ce-python-package- readme-writer.agent.md and ce-tiangolo-fastapi-reviewer.agent.md descriptions. Cowork's plugin validator rejects bare angle-bracket tokens; tests/frontmatter.test.ts was failing on these two local agents. Test state: 944 pass / 9 fail. Remaining 9 failures are pre-existing detect-project-type.sh monorepo probe tests in ce-polish-beta that were failing on baseline HEAD before this merge work began. Not introduced by this merge. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>