docs: Update plan (#2653)

[KATO-Hiro]

本番環境のログを1週間程度確認予定です

See #2689

Summary by CodeRabbit

• Documentation
  • Updated deployment plan notes to reflect completed staging validation, 24-hour error monitoring, and progression toward production deployment.
  • Synchronized timelines, statuses, and checklists across phases, marking relevant items as completed.
  • Refreshed author and last updated metadata.
  • Clarified progress tracking for upcoming production rollout.
  • No user-facing functionality changes in this release; updates are documentation-only.

[coderabbitai]

Walkthrough

The PR updates a single documentation file to mark multiple phases and sub-tasks as completed, adjust dates/statuses, set a Production deployment start date, and update author/last-updated metadata. No code or exported/public entities are changed.

Changes

Cohort / File(s)	Change summary
Docs plan status update docs/dev-notes/2025-10-13/fix-n-plus-1-query-for-prisma/plan.md	Checked off Phase 2.1–2.3 and Phase 4.1 items; set Production deployment start date; synchronized schedules and completion states for Phases 1–3; updated author and last updated date (2025-10-15).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

Thump-thump, my paws sign “done” in a row,
Checkboxes bloom like fields where carrots grow.
Staging slept quietly—errors none—hooray!
Production peeks over the hill today.
I nibble the dates, tidy and neat,
Hop to the merge—mission complete! 🥕🐇

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues Check	⚠️ Warning	The pull request only updates a project plan document and does not include any code modifications to address the N+1 query bug described in issue 2653, so it fails to meet the linked issue objectives.	Include the code changes necessary to fix the N+1 query problem in this pull request or separate the documentation updates into a standalone PR while adding the actual bug fix code here.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title succinctly describes the documentation update to the plan and correctly uses the docs scope and references the associated issue, making clear the primary change is updating project plans.
Out of Scope Changes Check	✅ Passed	The changes are limited to updating the plan markdown under docs and there are no modifications outside documentation, so no out-of-scope code changes are present.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch #2653

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[KATO-Hiro]

LGTM