Vendor opencode source for docker build

opencode/.opencode/tool/github-pr-search.txt

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+Use this tool to search GitHub pull requests by title and description.
+
+This tool searches PRs in the sst/opencode repository and returns LLM-friendly results including:
+- PR number and title
+- Author
+- State (open/closed/merged)
+- Labels
+- Description snippet
+
+Use the query parameter to search for keywords that might appear in PR titles or descriptions.