RFD: PM interface, cargo PM, and discovery & sync#258
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PM interface: JSON-RPC over stdio protocol, package-id tuples, four operations (resolve/search/fetch/list-deps), error handling, cache layout. Only path PM is built-in; cargo/git/recommendations are separate binaries. Cargo PM: resolve schema using cargo's dependency format, fetch via cargo toolchain, list-deps from Cargo.lock, plugin detection in crates. Discovery & sync: the two-phase algorithm (list-deps on all PMs, then search on all PMs for each dep), prompt UX, auto-install config, hook-triggered notification, debouncing. Co-authored-by: Claude <claude@anthropic.com>
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Summary
Adds three sub-RFDs as a follow-up to #253 and #257:
PM interface: JSON-RPC over stdio protocol for PM binaries. Package-id tuples, four operations (resolve/search/fetch/list-deps), error handling, cache layout. Only
pathis built-in; cargo/git/recommendations are separate binaries.Cargo PM: Resolve schema using cargo's dependency format, fetch via cargo toolchain, list-deps from Cargo.lock, plugin detection in crates.
Discovery & sync: The two-phase algorithm (list-deps on all PMs → search on all PMs for each dep), prompt UX, auto-install config, hook-triggered notification, debouncing.
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