Bump version to 0.18.0 for release

[Copilot]

Analyzed changes since 0.17.4 to determine appropriate version bump. Minor version bump warranted due to new feature addition.

Changes Since 0.17.4

• New Feature: Persistent index cache for faster cold starts (enableIndexCache option, enabled by default)
• Bug Fix: Strict equality operator in key validation (!== instead of !=)
• Test coverage improvements
• Documentation updates

Version Bump

• deno.json: 0.17.4 → 0.18.0
• docs/src/changelog.md: Added 0.18.0 entry

Minor bump chosen because the index cache adds a new public API option while remaining backwards compatible.

Original prompt

Look into changes since 0.17.4, and consider if revision, minor or major should be bumped. Then bump version and run test to ensure the repo is ready for next release.

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[Hexagon]

@copilot is changelog and docs updated?

[Copilot]

@copilot is changelog and docs updated?

Yes, both are updated in commit 113e951:

• deno.json: version bumped to 0.18.0
• docs/src/changelog.md: Added 0.18.0 entry with all changes (index cache feature, equality operator fix, test coverage improvements, documentation updates)