docs: add architecture deepening implementation plan

Why:
- The approved architecture design needs an executable task-by-task plan before implementation begins.
- A committed plan gives subagents a stable requirements source and preserves recovery context across long-running work.

What:
- Add a staged TDD implementation plan for candidate scanning, formatting-run extraction, settings catalog, Markdown segmentation, and URL formatting orchestration.
- Include exact files, interfaces, test commands, verification steps, and commit points for each stage.
This commit is contained in:
Kodai Nakamura 2026-06-22 01:13:22 +09:00
parent dabd8d428d
commit 92cc5ac7e5

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