Add 'tc-branch-cleanup' skill for canceling TeamCity builds

[labkey-tchad]

Rationale

After merging branches, there are often builds left queued on TeamCity. It would be handy to be able to clear out those builds so they don't consume TeamCity resources.
tc_branch_builds.py lists queued and running builds for a branch.
The tc-branch-cleanup leverages that script to cancel builds from a particular branch.

The script also works from the command line, without claude.

python3 .claude/scripts/tc_branch_builds.py my-branch --ids \
    | xargs -I{} teamcity run cancel {} --yes --comment "<comment>"

Related Pull Requests

• N/A

Changes

• Add script to list queued and running builds for a branch
• Add 'tc-branch-cleanup' skill for canceling TeamCity builds

[labkey-jeckels]

I used this to kill some builds that weren't needed. It worked but I had a couple of issues:

1. It requires install of the TeamCity CLI. I didn't have it. I updated the guidance for getting it installed.
2. It didn't find the feature branch because TeamCity doesn't use the fb_ prefix. I think this should be handled automatically when combined with the guidance in #1356