`php -l` syntax checking is redundant with the real linters/validators (PHPStan
parses the code, PHP-CS-Fixer and the PHPUnit bootstrap also fail on parse
errors). Remove the script and every reference to it:
- Makefile: drop the `syntax_check` target and its .PHONY entry.
- CI (ci.yml): drop the dedicated `lint` (PHP Syntax Check) job.
- Release workflows (build-release, build_pre-release): drop the "Check syntax"
step from the Quality Gate (PHPUnit remains).
- CONTRIBUTING.md: replace the syntax-check pre-commit guidance with the real
checks (make dev-tools / phpstan / cs / gates / phpunit).
- updates_checklist (en/ru): replace `make syntax_check` with the quality-check
suite and drop the stale "Security scan" snippet that referenced the removed
script and a non-existent tools/run_scan.sh (Semgrep runs automatically in CI).
Adds a Static Analysis section: how to run PHPStan, that CI fails only on new
issues (committed baseline), not to grow the baseline to hide real problems,
how to regenerate it, and the clear-result-cache caveat after stub/PHPDoc edits.
- add PHPUnit bootstrap and config under tests/
- add focused unit tests for GitHubReleases, InputValidator and FfmpegPaths
- fix GitHubReleases cache file handling when switching update channel
- document PHPUnit PHAR usage and debug run commands in RU/EN docs
- document SFTP sync for tests/ and contributor test workflow
- remove broad smoke coverage approach in favor of per-file tests
- Add tools/php_syntax_check.sh (supports full scan + single-file mode)
- CI workflow now calls the shared script
- All 6 agents updated to reference the script
- CONTRIBUTING.md: add Pre-Commit Checks section
- Exclude src/bin/* (third-party stubs) from lint
Divarion-D