chore(master): release 1.3.0

[github-actions]

🤖 I have created a release beep boop

1.3.0 (2026-04-01)

Features

• performance overhaul and new tree navigation APIs (b2a962d)
• support NUM_RUNS env var for model check iteration count (d1b04f9)

Bug Fixes

• add explicit return types to all public API methods (7df9e9b)
• additional code quality improvements from re-review (c0d35c4)
• chopAll _size mismatch when dirty tree produces duplicate fragments (be5ea9c)
• data drop in searchByLengthStartingAt, dead branches, stale docs (5f2560d)
• resolve lint errors (antfu/if-newline, mutable exports) (7f4a72c)
• restore NPM_TOKEN in release workflow and minor optimizations (cf03bb0)
• type safety and cleanup in bench script (67f16a5)
• use countIntervals() after fromIntervals to get the true count. (be5ea9c)

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