docs(ai-chat): add the 4.5.0-rc.6 changelog entry

[ericallam]

Summary

Adds the 4.5.0-rc.6 entry to the AI chat changelog, covering the chat-facing items shipping in #3870: the chat.agent reliability batch, the continuation boot latency fix, the chat.headStart hydration and reasoning fixes, the chat.createSession stop and continuation fixes, and the new trigger skills installer.

Should merge alongside the release so the changelog matches the published version.

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Latest commit: d08d971

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• docs/ai-chat/changelog.mdx

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• docs/ai-chat/changelog.mdx

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Walkthrough

This pull request adds a changelog entry for June 12, 2026 (4.5.0-rc.6) to docs/ai-chat/changelog.mdx. The entry documents chat.agent reliability fixes (deduplication, idempotent session.in appends, streaming state/turn-complete behavior, dashboard tag propagation, stream hygiene), continuation boot and cursor handling fixes, chat.headStart hydration/reasoning corrections, chat.createSession stop/continuation fixes, and a new CLI command trigger skills with an npx example. No code API or exported declarations were changed.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is incomplete relative to the template. It lacks required sections including Testing, Changelog, Screenshots, and the checklist, though it does provide adequate context about the change.	Complete the PR description by including all template sections: the checklist, Testing section, Changelog section, and Screenshots section (if applicable).

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a specific changelog entry for version 4.5.0-rc.6 to the AI chat documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Commit unit tests in branch docs/ai-chat-changelog-rc6

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✅ Devin Review: No Issues Found

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