Docs-only dry run: add runId capture note

[imKXNNY]

Summary\nAdd a short note to the full-auto dry-run checklist about capturing runId/chainId from webhook intake.\n\n## Acceptance Criteria\n- [ ] Add a brief note under Trigger -> Intake in docs/automation/full-auto-dry-run-checklist.md about recording runId/chainId.\n- [ ] Docs-only change (no code changes).\n

[imKXNNY]

✅ Successfully provisioned environment: npm ci

[imKXNNY]

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