[bot] Add /pr command, Extensions, preCompact hook, and devcontainer MCP support (CLI v1.0.3–v1.0.5)#13

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update/cli-v1.0.3-v1.0.5-features-62a22f2ccb3d571dnishanil/copilot-guide:update/cli-v1.0.3-v1.0.5-features-62a22f2ccb3d571dCopy head branch name to clipboard