Add the pull-request agent skill

.agents/skills/pull-request/SKILL.md

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+---
+name: pull-request
+description: Open a GitHub pull request using the project's template and including proof of work.
+user-invocable: true
+allowed-tools: Bash(cat .github/pull_request_template.md)
+---
+
+Use the following template for the PR description:
+
+```
+!`cat .github/pull_request_template.md`
+```

.claude/skills

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+../.agents/skills

.github/pull_request_template.md

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+<!--- If this PR is closing or supporting a Linear ticket, please link it to the ticket. For example, include the ticket ID in the PR title in brackets, like "[PD1-999] Port to highcharts" -->
+
+# Description
+<!--- Describe your changes in detail -->
+<!--- Why is this change required? What problem does it solve? -->
+
+# Risks
+
+<!--- The author should explain any risks posed by this change. -->
+
+# Testing
+
+## Author
+
+<!--- The author should show proof of work, such as the output of a script calling the changed SDK against a CVector API. -->
+
+## Reviewer
+
+<!--- The author should add instructions for manual test steps that the reviewer should cover, and any special setup instructions. State 'No testing is required.' if no additional testing is required by the reviewer. -->