feat(orchestrator): tasks tab with register, inbox and queue

Add a Tasks tab that lists the kvb-org-rasci register next to the inbox
and the heavy-job queue, in list, board and RASCI matrix views, each
task with its roles, WSJF, open work and the merge flow of its worktree.

- Task priority pins and WSJF estimates are signed with the operator's
  passkey and applied by the runner through rasci.py; the hub verifies
  the signature itself before it queues a job or logs the change, the
  runner verifies it again and runs only the checked argv, from /, with
  a pinned PATH and a 30 s process-group limit.
- The runner refuses task changes into a council that is a symlink, not
  owned by its uid or given by a relative path, and while the installed
  council.py, nofollow.py or rasci.py differ from the tree.
- Only tasks the hub can sign whole are editable (task slug and length).
- Page lookups keyed by register text use Object.hasOwn, so a status or
  party named like an Object.prototype member cannot break the views.
- The inbox screen renders through the tasks screen, so its task filter
  shows with "Wartet auf Operator" pressed.

Tests: 604 unit tests OK, e2e 15/15 OK (Chromium and Firefox).

🎯 Fix: 93 %
💥 Break: 5 %
💸 Cost: 100 %
⏱️ Time: –
🛡️ Security: 100 %
🏆 Score: 88
🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 %

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_hub_state.py

@@ -151,7 +151,7 @@ class TestHubState(HubCase):
             set(state),
             {
                 "now", "since", "until", "first", "alarm_since", "reviews", "asks", "decisions", "messages", "operator",
-                "register", "agent_order", "radio", "claims", "grants", "night", "silence", "graph",
+                "register", "tasks", "agent_order", "radio", "claims", "grants", "night", "silence", "graph",
                 "inbox", "pending", "rules", "approvers", "jobs", "views", "llm", "people", "settings", "media", "speech",
                 "badges", "kinds",
             },