fix: humanizeKeySequences should not replace standalone ESC byte

[pyramation]

Summary

Fixes humanizeKeySequences() in @inquirerer/test to not replace standalone ESC bytes (\u001b), which was breaking ANSI code stripping in downstream consumers.

The standalone ESC byte is the start of all ANSI escape codes (e.g., \u001b[97m for white text). When humanizeKeySequences() replaced \u001b with <ESCAPE>, it converted ANSI codes like \u001b[97m into <ESCAPE>[97m, which cleanAnsi() could no longer strip. This caused test snapshots in constructive to contain raw ANSI styling codes instead of clean output.

The fix:

• Removes the standalone ESC mapping from the key sequence replacements
• Changes the data structure from Record to ordered array to ensure longer sequences (like \u001b[A for UP_ARROW) are replaced before shorter ones could interfere

Review & Testing Checklist for Human

• Verify that removing standalone ESC replacement doesn't break any existing tests that expected <ESCAPE> in output
• After publishing, test in constructive repo that the snapshot tests in packages/cli/__tests__/cli.test.ts now pass with clean ANSI-stripped output
• Confirm the array ordering (longer sequences first) is correct for all edge cases

Test plan: After merging and publishing, update constructive's @inquirerer/test dependency and run pnpm test in packages/cli to verify snapshots no longer contain ANSI escape codes.

Notes

This is a prerequisite fix for migrating constructive's test utilities to use @inquirerer/test. The migration PR in constructive is blocked on this fix being published.

Link to Devin run: https://app.devin.ai/sessions/e5018850caff45ce8a126331548d69bc
Requested by: Dan Lynch (@pyramation)

[devin-ai-integration]

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