Housekeeping: ignore .idea, drop the stale cache, fail on deprecations

[loevgaard]

Fixes #33

Stacked on #53.

Changes

.gitignore. /.idea/ was untracked only because nobody had added it yet. Added, along with /.vscode/. Dropped the /.phpunit.result.cache entry, since that file no longer belongs at the root.

Stale cache. phpunit.xml.dist sets cacheDirectory=".build/phpunit", but a .phpunit.result.cache from before that change was still sitting at the repository root. Deleted.

Deprecations now fail the build. The suite reported three PHP deprecations on PHP 8.4, all from setono/bot-detection-bundle (BotDetector::__construct() parameter $popular and BotDetectorInterface::isBotRequest() parameter $request are implicitly nullable). Because they came from a dependency, they could not simply be fixed here, and while they were in the output a new deprecation from this bundle's own code would have gone unnoticed.

<source ignoreIndirectDeprecations="true"> limits reporting to deprecations triggered by code under src/, which makes failOnDeprecation="true" safe to turn on, together with failOnNotice and failOnWarning. The suite now reports OK (136 tests, 316 assertions) with nothing after it.

The configuration was also migrated to the current PHPUnit schema, which the runner had been warning about.

Still worth doing upstream: giving those two BotDetectorInterface parameters an explicit ?Type, since PHP 9 turns the deprecation into an error. Once released, the constraint here can be bumped and ignoreIndirectDeprecations revisited.

Note on Codecov

The coverage job uploads to Codecov but nothing consumes the result. That is handled in the test coverage PR rather than here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.97%. Comparing base (064cf2d) to head (05661e3).

Additional details and impacted files

@@                    Coverage Diff                     @@
##             fix/30-bundle-structure      #54   +/-   ##
==========================================================
  Coverage                      81.97%   81.97%           
  Complexity                       171      171           
==========================================================
  Files                             35       35           
  Lines                            538      538           
==========================================================
  Hits                             441      441           
  Misses                            97       97           

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