chore: rename markitect_project to markitect-main across project

Finishes the in-progress rename so docs, configs, tests, and capability
manifests all reference the current repo name consistently. Fixes two
tests (test_roundtrip_consolidated.py, test_issue_140_roundtrip_simplified.py)
whose hardcoded cwd paths would have broken under the renamed directory.

Archival content under history/, reports/, and roadmap/eat-the-frog/, plus
derived artifacts (.venv_old/, node_modules/, asset_registry.json) are
intentionally left untouched.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

capabilities/release-management/README.md

@@ -162,7 +162,7 @@ clean_before_build = true
 [tool.release-management.registries.gitea]
 url = "http://92.205.130.254:32166"
 owner = "coulomb"
-repo = "markitect_project"
+repo = "markitect-main"
 auth_token_env = "GITEA_API_TOKEN"
 
 [tool.release-management.registries.pypi]