chore(release): v0.13.9

[github-actions]

Cut CMakeLists, changelog, and install pins to v0.13.9. Squash-merge and keep this title; the version workflow then tags v0.13.9 and publishes binaries. main requires pull requests, so the bot cannot push this commit directly.

Confidence Score: 4/5

The release-version changes appear safe to merge, but the non-blocking changelog duplication should be corrected so the published v0.13.9 notes remain accurate.

Summary

This PR prepares the v0.13.9 release by synchronizing the project version, documented installation pin, and website binary-release configuration, and by cutting a new changelog section.

• Updates the CMake project version to 0.13.9.
• Points documentation and website downloads at v0.13.9.
• Creates the 0.13.9 changelog section, although it currently includes entries already attributed to older releases.

_{Reviews (1) · Last reviewed commit: "chore(release): v0.13.9"}

[greptile-apps]

Duplicated release notes

The new 0.13.9 heading assigns the following Fixed block to this release, but that block repeats fixes already published under earlier versions. For example, entries #324, #322, #327, and #331 at lines 49–64 also appear under 0.13.8 at lines 109–124. Remove the previously released entries so the 0.13.9 notes accurately describe this release.

Prompt To Fix With AI

This is a comment left during a code review.
Path: CHANGELOG.md
Line: 10

Comment:
**Duplicated release notes**

The new 0.13.9 heading assigns the following `Fixed` block to this release, but that block repeats fixes already published under earlier versions. For example, entries #324, #322, #327, and #331 at lines 49–64 also appear under 0.13.8 at lines 109–124. Remove the previously released entries so the 0.13.9 notes accurately describe this release.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.