Draft changelog: Dynamic CI job configuration and force run

[mintlify]

Summary

Adds the October 5, 2026 changelog entry for Dynamic CI per-job configuration and Force Run from GitHub.

Changes

• New entry changelog/2026-10-05-dynamic-ci-job-configuration-and-force-run.mdx. It covers the new features first, then updates.
• Ran scripts/sync-changelog.py to update docs.json and changelog/index.mdx. This adds an October 2026 group.
• Uses the new category Dynamic CI. Dynamic CI doesn't have a product changelog page.

Context

• Since the last entry on September 30, the repo history has only one commit, a dashboard edit to ci/dynamic-ci/configuration.mdx. I based the entry on the current Dynamic CI docs.
• Dynamic CI is in private beta, and the entry says so. Two other draft PRs opened today ("Dynamic CI per-job configuration" and "Dynamic CI force run from GitHub") overlap with this one. Keep one and close the others.
• I left out Force Run from the web app and the API because those doc sections are still placeholders.

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Project	Status	Preview	Updated
trunk	🟢 Ready	View Preview	Oct 5, 2026, 5:35 PM