docs(claude): codify workflow and task tracking loop

[akiojin]

Summary

• Add a Claude Code運用ワークフロー section to CLAUDE.md so planning, verification, and autonomous bug-fix behavior are explicit for this repository.
• Create tasks/todo.md and tasks/lessons.md so non-trivial work tracking and correction-driven learning can be persisted across sessions.
• Wire CLAUDE.md improvement-loop rules to concrete files so the workflow can be executed immediately instead of remaining conceptual.

Changes

• CLAUDE.md: Added workflow rules for plan-first execution, subagent strategy, verification-before-done, elegance checks, autonomous bug fixing, and task/lesson file linkage.
• tasks/todo.md: Added a reusable task log template and recorded this implementation as the initial completed entry.
• tasks/lessons.md: Added a reusable lessons template and recorded an environment fallback rule for markdown lint execution.

Testing

• npx --yes markdownlint-cli CLAUDE.md tasks/todo.md tasks/lessons.md --config .markdownlint.json --ignore-path .markdownlintignore — command exits with status 0.

Related Issues / Links

• None

Checklist

• Tests added/updated — N/A: documentation/template-only change.
• Lint/format passed (cargo clippy, cargo fmt, svelte-check) — N/A: no Rust/Svelte code changes; markdownlint check was executed as documented above.
• Documentation updated (if user-facing change)
• Migration/backfill plan included (if schema/data change) — N/A: no schema/data changes.
• CHANGELOG impact considered (breaking change flagged in commit) — N/A: no breaking/runtime behavior change.

Context

• This branch implements follow-up work to operationalize CLAUDE.md guidance by adding concrete task and lesson artifacts under tasks/, making the new workflow actionable for subsequent development sessions.

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✨ Finishing Touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/update-claude-md

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