#1418 release: v0.64.0

Accepted agent delivery; branch-keyed search descriptor included.

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Summary by cubic

Releases v0.64.0 across all crates and npm packages, updates the what's-new announcement for the OpenCode and Pi plugins, and moves the macOS release builds to CortexKit's Mac mini after the rented Mac's slow artifact downloads.

The announcement highlights a new index store that speeds up call graph construction, edits, and dead-code checks while reducing disk and memory usage, and shared indexes across worktrees. It also notes trace_to root labels and deferred analysis on aft_inspect.

Bug Fixes

• Fixes release.sh so the crates.io package size check packages all release crates in one cargo run, resolving aft-store from the same run before its first release.