Add unit tests for the tool functions of replace_tool and special page configuration

[kanasimi]

Summary

The repo had no test infrastructure at all (no test script, no framework, no CI), so coverage was 0% for every file. Only two files are require()-able modules rather than one-shot bot scripts — replace/replace_tool.js and special page configuration.js — so this adds a node:test suite (no new dependencies) covering their pure tool functions: 41 tests, all offline.

• npm test → node --test test/, npm run test:coverage → same with --experimental-test-coverage.
• test/helper.js loads wiki loader.js the way the bot scripts do, and creates wiki configuration.js from the sample when missing, so tests run on a fresh clone without credentials.
• replace/replace_tool.js: exported the already-pure helpers (convert_special_move_to, unshift_move_configuration, normalize_page_title_token, remove_slash_tail, text_processor_for_search, text_processor_for_exturlusage) so they can be tested; no behavioral change to the exports used by task files.
• Added .gitignore for node_modules/, package-lock.json and the private wiki configuration.js.

One real bug found while testing text_processor_for_exturlusage: the URL pattern was built from a normal string, so '\W' collapsed to the literal W and URLs were only replaced at the very start of the wikitext (i.e. see [http://old.example.com/page] was left untouched).

-new RegExp('(^|\W)' + CeL.to_RegExp_pattern(move_from_link), 'g')
+new RegExp('(^|\\W)' + CeL.to_RegExp_pattern(move_from_link), 'g')

Not covered (needs a live wiki session): get_all_sections, main_move_process, parse_move_pairs_from_page and the rest of the API-driven flow. Those would need an injectable session/HTTP mock to be testable.

Link to Devin session: https://app.devin.ai/sessions/7b5c7d5e46cc4ce39db5e8d0cc5839a1
Requested by: @kanasimi

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