Add application skeleton and developer tooling

[josiahking]

Summary

• add the initial evolvephp/skeleton application project with explicit CLI composition
• expose the Core CLI application and stream output composition APIs as experimental
• add doctor and route:list to the generated application CLI
• add evolvephp/dev-tools with module:new and plugin:new generators
• add generated module and plugin starter tests
• add RecordingCommandOutput to evolvephp/testing
• expand release tooling and package validation to the seven-package graph
• add real offline Composer create-project validation, including generator and no-dev checks
• bound release validation subprocesses and reduce the skeleton validator's offline dependency closure
• update architecture, static-analysis, coding-standard, documentation, and CI policy coverage

Validation

• composer quality
  • 675 tests
  • 2445 assertions
  • PHPStan clean
  • PHP-CS-Fixer clean
  • Deptrac: 0 violations and 0 uncovered
• composer release:skeleton:validate
• composer release:validate
• composer release:consumer:validate
• composer release:split:validate
• composer supply-chain
• composer validate --strict --check-lock

The application skeleton validation uses real Composer create-project with Packagist and network access disabled, validates generated commands and tests, verifies production --no-dev behavior, and preserves source repository state.