feat(array): add arrIndexOfSubset() and arrLastIndexOfSubset()

[nev21]

Locates the first/last index at which an array of values matches contiguously within another, re-searching later/earlier occurrences of the leading value when it repeats (e.g. matching one stack trace against another) instead of stopping at the first, wrong occurrence. A subset that runs off the end of theArray still matches against its available prefix, so a shorter (e.g. truncated) array can be matched against a longer one, or vice-versa.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.19%. Comparing base (ef09e0d) to head (2e30ee5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #592      +/-   ##
==========================================
+ Coverage   99.17%   99.19%   +0.01%     
==========================================
  Files         179      180       +1     
  Lines        5481     5573      +92     
  Branches     1212     1285      +73     
==========================================
+ Hits         5436     5528      +92     
  Misses         45       45              

Files with missing lines	Coverage Δ
lib/src/array/arrIndexOfSubset.ts	100.00% <100.00%> (ø)

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[Copilot]

Pull request overview

This PR introduces two new array utilities, arrIndexOfSubset() and arrLastIndexOfSubset(), for finding the first/last contiguous occurrence of a “subset” sequence within a larger array/array-like value, with special handling for repeated leading values and for subsets that overrun the end of the target array.

Changes:

• Added arrIndexOfSubset() / arrLastIndexOfSubset() implementation and exported them from the public entrypoint.
• Added common test coverage for both functions (including array-like inputs and repeated-leading-value scenarios).
• Updated docs/changelog and adjusted bundle/size-limit thresholds to account for the added code.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
README.md	Lists the new Array / ArrayLike helpers in the utilities index.
lib/src/array/arrIndexOfSubset.ts	Adds the new subset-search implementations and TSDoc.
lib/src/index.ts	Exposes the new helpers from the package root exports.
lib/test/src/common/array/arrIndexOfSubset.test.ts	Adds tests for the new helpers.
CHANGELOG.md	Notes the new feature under Unreleased.
lib/test/bundle-size-check.js	Raises bundle size thresholds for minified builds.
.size-limit.json	Raises size-limit thresholds for ES5/ES6 builds.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

[nevware21-bot]

Approved by nevware21-bot

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

[nevware21-bot]

Approved by nevware21-bot