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/markitect-content/tests/test_issue_46_schema_generation_outline.py

@@ -8,7 +8,7 @@ This test module validates outline mode schema generation improvements including
 - Content instruction integration
 - End-to-end workflow from example document to generated drafts
 
-Created for Issue #46: https://gitea.coulomb.social/coulomb/markitect_project/issues/46
+Created for Issue #46: https://gitea.coulomb.social/coulomb/markitect-main/issues/46
 """
 
 import pytest