chore(master): release 2.1.0

[hexsprite]

🤖 I have created a release beep boop

2.1.0 (2026-10-04)

Features

• add IntervalTree.fromJSON for exact serialize round trips (bfe9bbe)
• export ArrayIntervalCollection as reference implementation (c4ccdf6)
• widen IntervalCollection to the full API (54cf430)

Bug Fixes

• add exports map so require() resolves the cjs build (8619f02)
• align ArrayIntervalCollection hash and constructor with IntervalTree (d72a67b)
• correct chop assertion message (05a2fd3)
• default invariant checks off and read flag at runtime (ccef5d9)
• guard searchByLengthStartingAt against non-positive minLength (e7e6639)
• keep same-start intervals sorted by end so equals/first/last are order-independent (29d5cad)
• make empty chop ranges a no-op and validate chopAll ranges up front (a81addd)
• make verify() read-only and check every invariant (fe229e1)
• require a gap between intervals in a clean tree (53ab6ce)
• return the largest-end interval from last() and document canonical order (b7ae950)
• sort searchByLengthStartingAt results after clipping to startingAt (686140c)
• stop chopAll from mutating the caller's ranges (5875f5d)
• verify strict ordering of left child (a927b23)

Performance Improvements

• copy augmentation fields in Node.clone instead of recomputing (6a06086)
• early-exit contains() and overlaps() (802dd09)
• faster add, remove, chop, chopAll, and removeEnveloped (5–12% in the bundled benchmarks): the tree core now tracks its own size and reports insert/remove results without module-level state (03c9d74)

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[hexsprite]

🤖 Created releases:

• v2.1.0

🌻

[codspeed]

Merging this PR will not alter performance

✅ 39 untouched benchmarks

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_{Comparing release-please--branches--master--components--intervaltree (06e51b4) with master (f704b4b)}