feat: unified source cache for multi-feature install#1

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wfscot wants to merge 14 commits intomainfrom

feat/unified-source-cache

Commits on Mar 13, 2026

refactor: address code review findings from PR self-review
wfscot
committed

Commits on Mar 14, 2026

test: add integration tests for multi-feature fetch, MCP merge, and curated backward compat
wfscot
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