Constrain OpenCode dispatch to relay worktrees

[sungjunlee]

Closes #620.

Summary

• Pass --dir <relay-worktree> to opencode run and prepend a worktree-boundary prompt so OpenCode dispatch operates inside the relay worktree.
• Run live dogfood helper scripts from absolute paths in this repository, so clean-base canaries execute current branch code against a temporary target checkout.
• Update OpenCode executor and dispatch integration tests for the new argv/worktree contract.

Live dogfood evidence

• RELAY_HOME=$(mktemp -d) node skills/relay-dispatch/scripts/live-dogfood.js --repo . --scenario opencode-dispatch-canary --dispatch-timeout 180 --command-timeout-ms 300000 --json --markdown
• Outcome: pass
• Dispatch base: origin/main
• Run reached review_pending and produced PR relay live dogfood dispatch canary opencode 1780233968000 #669 with prCreatedByUs: true.
• PR relay live dogfood dispatch canary opencode 1780233968000 #669 was closed after validation because it was a canary evidence PR, not intended to land.

Validation

• node --test tests/relay-dispatch/scripts/executors.test.js tests/relay-dispatch/scripts/live-dogfood.test.js tests/relay-dispatch/scripts/docs-defaults.test.js
• node --test tests/relay-dispatch/scripts/dispatch.test.js
• node --test tests/relay-dispatch/scripts/*.test.js
• node --test tests/skills-lint/scripts/*.test.js
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: abe41357-cb80-445d-bade-dfea525abf50

📥 Commits

Reviewing files that changed from the base of the PR and between fb563d2 and 958ed84.

📒 Files selected for processing (4)

• skills/relay-dispatch/scripts/executors/opencode.js
• skills/relay-dispatch/scripts/live-dogfood.js
• tests/relay-dispatch/scripts/dispatch.test.js
• tests/relay-dispatch/scripts/executors.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/opencode-dispatch-worktree-prompt

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[sungjunlee]

Local review LGTM. Codex and CodeRabbit did not provide substantive review due usage/rate limits; CI is green and local validation passed: node --test tests/relay-dispatch/scripts/*.test.js, node --test tests/skills-lint/scripts/*.test.js, and git diff --check.