feat(automations): add execution ledger

[cnjack]

Summary

• persist every SCM, Cron, and manual Automation trigger decision in a durable execution ledger
• add idempotent Run-now, projected execution states, repair ownership, output links, and a focused execution-history UI
• support Cron create_card output through deterministic jtype Card materialization and the existing Service Kanban claim/Run/writeback loop
• preserve Viewer read-only Card deep links while requiring Member for writes and protecting the managed jcode-automation/ namespace

Product contract

• docs/25-automation-execution-ledger.md
• prototype: design/automation-executions.html
• jtype dependency: feat(board): support host-integrated Card details jtype#65 at a83f55b8112cc534f42c66e9f8f1b6274ce3706d

Verification

• cd orchestrator && go test ./...
• real PostgreSQL: JCLOUD_PG_DSN=... go test ./internal/store/
• cd console && pnpm test — 71 files / 593 tests
• cd console && pnpm typecheck
• jtype board-react: build, 21 unit tests, 8 embed E2E tests

Independent review

Kimi CLI and Grok CLI reviewed the product/UX, authorization, idempotency, polling, and cross-repo contract. Their findings drove the managed Card-root support, read-only supplement, indirect Run-state filter projection, and recoverable Card polling fixes. Grok final: no P0/P1 findings; Kimi final focused run was still in progress when this PR was opened.

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