feat: add Wikipedia plugin with 2 question templates

[dataCenter430]

Summary

Adds a Wikipedia plugin that fills two capability gaps identified in
CLAUDE.md that no existing plugin covers:

Gap	How it's addressed
Nested structure navigation	edit_count: article → "View history" tab → count dated revisions
Search-driven interaction	category_count: main page → navigate to Category page → read count

Plugin (wikipedia)

• Allowed domain: en.wikipedia.org- Blocked: */w/api.php* and */api/rest_v1/metrics* — forces agents to use the web interface, not the raw API
• needs_api_data fires only for category pages and ?action=history pages; all other Wikipedia pages are navigation-only (no wasted API calls)
• Session reuse via shared aiohttp.ClientSession, 1 req/s rate limit

Templates

wikipedia_category_count

How many articles are in the Wikipedia category "[X]"?
How many subcategories does the Wikipedia category "[X]" have?

• Agent navigates to Category:X and reads the count from the page header
  ("The following N pages are in this category")
• GT: categoryinfo.pages / categoryinfo.subcats — exact same number
  shown on page
• Variant space: 251 categories × 2 metrics = 502 variants ✓

wikipedia_edit_count

How many times has the Wikipedia article "[Title]" been edited in the
past 7/14/30 days?

• Agent opens the article, clicks "View history", counts timestamped revisions within the window
• GT: revision timestamps fetched over the past 35 days; count uses fetched_at as the reference "now" so GT reflects what the agent saw, not a later wall-clock time
• Variant space: 201 articles × 3 time windows = 603 variants ✓
• Answers change every few hours for active articles

Red Team Review (all 6 checks pass)

Check	category_count	edit_count
1. API semantic	categoryinfo.pages = page header count ✓	rvprop=timestamp = history timestamps ✓
2. World knowledge	Exact counts unknown to LLM (<60%) ✓	Edit counts not in training data ✓
3. Variant space	502 ≥ 500 ✓	603 ≥ 500 ✓
4. Answer stability	Time-based categories change weekly ✓	Changes every edit (hours) ✓
5. Random baseline	Wide integer range, ~0% ✓	Wide integer range, ~0% ✓
6. Cross-param collapse	Different categories → different counts ✓	Different articles → different rates ✓

Tests

tests/plugins/wikipedia/test_wikipedia_templates.py — 69 tests, all passing:

• Template registration, generation determinism, JSON-serialisability
• category_count GT: found, fuzzy/underscore title match, not_collected, no-collector system_error, ignores non-category data
• edit_count GT: 7/14/30-day window counts, zero-edit case, malformed fetched_at → system_error, ignores non-history data
• Plugin URL routing: 11 needs_api_data cases, dispatch mocked correctly
• titles_match / normalize_title helpers
• Pool size and duplicate assertions

Checklist

• eval.py tested with multiple seeds (10-minute timeout)
• Red team self-attack pass completed (all 6 checks documented above)
• All files under 500 lines
• No silent fallbacks (or 0, bare except: pass)
• needs_api_data returns False for navigation-only pages
• 69 unit tests passing, no regressions in existing suite