chore: remove the release-rehearsal entry

[crypticpy]

Removes the rehearsal entry published via #52 after live verification on the deployed showcase (entry page and search index). Completes the RR-H03 rehearsal's cleanup promise on this repository; npm run validate passed locally.

🤖 Generated with Claude Code

https://claude.ai/code/session_014sAVayAT2tkQ7p9U2o9CsD

Summary by Sourcery

Chores:

• Remove the release-rehearsal catalog entry after completing live publishing verification and cleanup.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Deletes the release-rehearsal catalog entry following verification of the deployed showcase entry page and search index, completing the RR-H03 cleanup.

File-Level Changes

Change	Details	Files
Remove the release-rehearsal catalog entry after live publishing verification.	Delete the rehearsal entry and its associated content from the catalog.	catalog/release-rehearsal-live-publishing-check/index.md

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