chore(main): release 0.51.0

[github-actions]

🤖 I have created a release beep boop

0.51.0 (2026-09-02)

Features

• safe-outputs: support cross-organization repository writes (#2087) (f789429)

Bug Fixes

• mcpg: plumb custom MCP pipeline variables (#2088) (59a7e9f)
• safe-outputs: accept create-work-item temporary IDs in comment-on-work-item (#1925) (30ba3db)
• safe-outputs: make create-work-item body field configurable (#1926) (9ef8855)
• safe-outputs: reject cross-organization repos in create-pull-request (#1935) (c636f17)
• safe-outputs: support GitHub App comment replacement (#2082) (c9de348)
• workflows: avoid duplicate documentation PRs (#2084) (5aa1b92)
• workflows: wait for rust-critic/ts-critic sub-agent results (#1973) (01ec634)
• workflows: wait for TypeScript reviewer subagent (#2083) (e17597d)

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[github-actions]

🤖 Created releases:

• v0.51.0

🌻