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>

orchestrator/templates/index.html.j2

@@ -407,6 +407,8 @@ pre.notes { margin: 0; padding: 8px 10px; background: var(--sunken); border-radi
 {% include "style-inbox.css" %}
 
 {% include "style-ui.css" %}
+
+{% include "style-tasks.css" %}
 </style>
 </head>
 <body>
@@ -506,10 +508,16 @@ pre.notes { margin: 0; padding: 8px 10px; background: var(--sunken); border-radi
 
 {% include "page-tree.js" %}
 
+{% include "page-flow.js" %}
+
 {% include "page-cleanup.js" %}
 
 {% include "page-offices.js" %}
 
+{% include "page-tasks.js" %}
+
+{% include "page-tasks-prio.js" %}
+
 {% include "page-time.js" %}
 
 {% include "page-pulses.js" %}