Relocate the dev-tooling config into build/ so the project root only holds
source and first-class project files:
- phpstan.dist.neon -> build/phpstan.dist.neon
- phpstan-baseline.neon -> build/phpstan-baseline.neon
- .php-cs-fixer.dist.php -> build/.php-cs-fixer.dist.php
- .php-cs-fixer.cache -> build/ (regenerated there; gitignored)
Because neon/CS-Fixer resolve relative paths against the config file's own
directory, the internal references are re-anchored one level up (src/ ->
../src/, tools/ -> ../tools/, Finder in(__DIR__.'/../src'); the baseline's
path: entries likewise). The Makefile now points PHPStan at the config with
-c build/phpstan.dist.neon (it previously relied on root auto-discovery),
generates the baseline into build/, and passes --config=build/... to CS-Fixer;
the CS-Fixer cache is pinned to build/ via setCacheFile and re-gitignored.
No behaviour change. Verified: make phpstan (No errors), make cs (0 fixable),
make gates. CI runs through these make targets, so it is covered.
Documents each tool in tools/ and its purpose, grouped by role: CI gates,
PHPStan support, the PHPUnit runner, manual panel test/QA utilities
(test_player_api.sh, stream_queue_check.py, test-stream-generator,
dts-audio-test, test-install), and repo maintenance
(update_top_contributors.py). Makes the previously-unreferenced manual test
utilities discoverable.
Divarion_D