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downloader modules
Phase 1 infrastructure for the install command:
- constraint: Composer-compatible version parsing and constraint matching
(caret, tilde, wildcard, hyphen range, OR/AND combinators)
- lockfile: composer.lock read/write with content-hash computation
- installed: vendor/composer/installed.json registry (Composer 2.x format)
- downloader: dist archive download with SHA-1 verification and
zip/tar.gz extraction with top-level directory stripping
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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