Skip signed/jsweep/* branches in PR Description Updater

[Copilot]

The PR Description Updater was deterministically failing on merged PRs from signed/jsweep/* branches, consuming agent time and tokens before exiting. This change short-circuits those runs at the workflow gate so the updater only runs for supported merged PR branches.

• What changed

  • Added a branch exclusion to the workflow-level if: condition in pr-description-caveman.md.
  • Recompiled pr-description-caveman.lock.yml so the generated workflow carries the same guard in the effective activation path.

• Why this matters

  • Prevents known-noisy auto-generated/signed jsweep branches from entering the agent flow.
  • Avoids wasted spend on runs that are not expected to produce a useful PR description update.

• Guard added

  if: github.event.pull_request.merged == true && !startsWith(github.event.pull_request.head.ref, 'signed/jsweep/')

• Scope

  • No prompt-body changes.
  • No behavior change for non-signed/jsweep/* merged PRs.

[Copilot]

Pull request overview

This PR prevents the PR Description Updater workflow from running on merged PRs whose head branch starts with signed/jsweep/, avoiding deterministic failures and wasted agent/runtime spend by gating activation earlier.

Changes:

• Added a frontmatter if: guard to skip merged PRs from signed/jsweep/* branches.
• Recompiled the generated workflow so the same guard is applied in the effective pre_activation and activation job conditions.

Show a summary per file

File	Description
.github/workflows/pr-description-caveman.md	Adds a workflow gate to exclude merged PRs from signed/jsweep/* branches before the agent flow starts.
.github/workflows/pr-description-caveman.lock.yml	Carries the same exclusion into the compiled workflow’s pre_activation/activation conditions.

Review details

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• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Low