docs: Summarize contest_table_provider in dev-notes (#2989)

[KATO-Hiro]

close #2989

See: #2919, #2830, #2836, #2835, #2837, #2838, #2776, #2785, #2797, #2920,

Summary by CodeRabbit

• Documentation
  • Added a comprehensive user-facing guide for adding ContestTableProviders, covering TDD workflow, implementation patterns, tests, and examples.
  • Removed multiple internal planning documents that outlined detailed test plans, mock strategies, and refactor roadmaps for various providers.

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[coderabbitai]

Walkthrough

Removed eleven provider-specific test planning documents and added a single comprehensive TDD guide for implementing and testing ContestTableProvider implementations, consolidating prior plans into one actionable how-to document.

Changes

Cohort / File(s)	Summary
Removed provider-specific plans docs/dev-notes/2025-11-01/add_and_refactoring_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-11-03/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-11-06/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-11-12/add_provider_key_for_contest_table_provider/plan.md, docs/dev-notes/2025-11-14/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-11-15/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-11-19/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-12-03/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-12-10/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-12-11/add_tests_for_contest_table_provider/plan.md, docs/dev-notes/2025-12-17/add_tests_for_contest_table_provider/plan.md	Deleted eleven detailed planning documents. Removed content included test cases, mock data designs, multi-phase refactor plans, timelines, and lessons learned. No code or public API changes.
Added consolidated guide docs/guides/how-to-add-contest-table-provider.md	Added a new TDD-style guide for adding ContestTableProvider implementations: skeletons, three implementation patterns (range-filter, single-source, composite-source), test design guidance, Vitest examples, mock strategies, Tessoku Book integration notes, and FAQs. Documentation-only addition (+711 lines).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 I hopped through scattered notes today,
Collected plans and chased the fray,
Wove tests and guides into a strand,
A tidy map from paw and hand,
🥕 Ready for TDD to play.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: consolidating dev-notes entries for add_tests_for_contest_table_provider into a summary.
Linked Issues check	✅ Passed	The PR successfully consolidates multiple dev-notes planning files into a single comprehensive guide (docs/guides/how-to-add-contest-table-provider.md), addressing issue #2989's objective to reduce duplication.
Out of Scope Changes check	✅ Passed	All changes are in scope: deletions of redundant plan.md documentation files and creation of a consolidated guide directly align with the consolidation objective stated in issue #2989.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@docs/guides/how-to-add-contest-table-provider.md`:
- Around line 111-115: The doc lists getContestRoundLabel() without parameters
but the example shows getContestRoundLabel(contestId: string); update the guide
to match the real interface: change the requirements bullet to
`getContestRoundLabel(contestId: string)` (or alternatively update the example
to the no-arg form if the interface is actually parameterless) and make the same
change for the other occurrence noted (lines 143-145) so the signature is
consistent across the document; reference getContestRoundLabel to locate and fix
both spots.
- Around line 175-203: The examples in this guide use the instance method
filter(...) but the base API expects setFilterCondition(...); update the example
implementations to call setFilterCondition and pass the predicate used in filter
(e.g., the lambda that extracts round via extractRound and checks 1..41) so
behavior matches the base class contract; also update any other example blocks
that use filter (the later occurrences of the same pattern) to use
setFilterCondition, and keep getMetadata, getDisplayConfig, and
getContestRoundLabel unchanged except for referencing the new filter setup.

[KATO-Hiro]

LGTM