Tooling alignment

[niden]

Hello!

• docs: BSD-3-Clause LICENSE text; rebuild README for new tooling
• ci: main.yml workflow (quality/tests/coverage), 3-ecosystem dependabot, issue templates, code owners
• ci: octocov coverage gates (100% floor, PR no-regression)
• test: per-method Parser suite at 100% coverage; retire monolithic test
• quality: configs under resources/ (phpcs, phpstan max, php-cs-fixer, phpunit 9.x); annotate Parser
• composer: plain-phpunit tooling, 8.0 platform pin, resources scripts
• docker: single parameterized image under resources/docker

[github-actions]

Code Metrics Report

Coverage	Test Execution Time
100.0%	1s

Code coverage of files in pull request scope (100.0%)

Files	Coverage
src/Parser.php	100.0%

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Reported by octocov