[diffs/edit] Fix batch edit ordering sensitivity

[ije]

Batch edit ordering sensitivity (1) — accepting a batch containing a
delete and an insert at the same offset depends on the caller's array order:
delete-first throws an overlap error, insert-first succeeds.

Fixed batch edit ordering sensitivity.
Equal-start edits now sort by end offset, placing inserts before deletes regardless of caller order.

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Project	Deployment	Actions	Updated (UTC)
pierre-docs-diffs	Ready	Preview	Jul 15, 2026 4:36pm
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[ije]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

pierre/packages/diffs/test/README.md

Line 106 in 2c2f975

## Known bugs pinned as `test.failing` (30)

Update the pinned known-bug total

After removing the batch-edit ordering bullet and converting its test.failing case to a passing test, the category counts in this section now add up to 29, but the heading still advertises 30. This README is the triage list for pinned failing tests, so the stale total will mislead future cleanup tracking unless it is decremented with the removed item.

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