Replace the bootstrap file with declarative registration

[alistair3149]

Summary

Removes the root SemanticCompoundQueries.php bootstrap and registers everything it did declaratively in extension.json. The only piece that cannot be declarative — the #compound_query parser function — moves into a small SCQ\Hooks ParserFirstCallInit handler (MediaWiki has no declarative parser-function registration).

Moved into extension.json

• The i18n magic-words file → ExtensionMessagesFiles
• The compoundquery API module (with the SMW.QuerySourceFactory service) → APIModules
• The #compound_query parser function → HookHandlers + Hooks (handled by the new SCQ\Hooks)

Removed

• SemanticCompoundQueries.php and the SemanticCompoundQueries class
• callback, ExtensionFunctions, and AutoloadClasses from extension.json
• load_composer_autoloader and the composer autoload block — the extension has no runtime composer dependencies (require is only php plus the install-time composer/installers), so vendor/autoload.php is never needed at runtime; SCQ\ is autoloaded via AutoloadNamespaces
• The SCQ_VERSION constant and its two consumers: a dead CompoundQuery::getVersion() override (it overrode ApiBase::getVersion(), removed from MediaWiki core long ago) and a version line in the PHPUnit bootstrap (now read from extension.json)
• The runtime !defined( 'SMW_VERSION' ) guard — requires.extensions.SemanticMediaWiki already enforces SMW's presence at registration

Test fix included

I18nJsonFileIntegrityTest now handles the canonical array form of wgMessagesDirs['SemanticCompoundQueries']. The old bootstrap overwrote MediaWiki's array (built from MessagesDirs) with a bare string, which the test relied on; removing the bootstrap restores the array, so the test reads the first directory entry.

No user-facing change: #compound_query and the compoundquery API module register with identical names and behaviour. The removed class and constant are internal-only and undocumented, and 7.0.0 is unreleased.

Test plan

• composer analyze — clean (lint + PHPCS + minus-x)
• composer test — green (63 tests, 121 assertions), including a new HooksTest and CompoundQueryTest::testExecute (which issues an action=compoundquery request, exercising the API-module registration)
• Manual smoke test on a dev wiki: Special:Version lists the extension at 7.0.0-alpha; {{#compound_query:…}} renders a result table; action=compoundquery returns results; the compound_query magic word resolves

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.56%. Comparing base (6932a8d) to head (ba6bec9).

Files with missing lines	Patch %	Lines
src/Hooks.php	0.00%	2 Missing ⚠️

❌ Your project check has failed because the head coverage (29.56%) is below the adjusted base coverage (30.08%). You can increase the head coverage or adjust the Removed Code Behavior.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #94      +/-   ##
============================================
- Coverage     30.08%   29.56%   -0.53%     
- Complexity       40       41       +1     
============================================
  Files             3        4       +1     
  Lines           113      115       +2     
============================================
  Hits             34       34              
- Misses           79       81       +2     

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