Kodai Nakamura ef7e233a47 docs: add architecture deepening design ... Why: The architecture review identified five related deepening opportunities that should be implemented in a staged, testable sequence rather than as ad hoc refactors. What: Document the approved design for candidate scanning, formatting runs, settings catalog, Markdown protected segments, and URL formatting adapters, including scope, non-goals, testing strategy, migration order, risks, and success criteria.		2026-06-22 00:46:15 +09:00
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specs	docs: add architecture deepening design	2026-06-22 00:46:15 +09:00