fix(gateway): working exits for wedged agents + declare_coverage roll-up unblock (#341)

A live task burned 5+ hours because every exit was locked. unclaim now
works from verifying and needs_revision (service guard + lifecycle edge);
the circuit breaker and the i_am_done push-failure remediate name the
working chain ending in unclaim(); sync_branch(stash=true) clears the
DIRTY_WORKSPACE dead-end (pop-conflict preserves the stash); blocking a
task QA already owns now says to idle instead of listing states; the
orchestrator auto-block logs real errors and skips states where blocking
is meaningless instead of force-blocking them.

declare_coverage (cell/main PM) retroactively stamps parent-AC refs on a
child that implements them -- closing the roll-up deadlock where the
declaring child was cancelled and its re-delegated replacement completed
the work uncredited. Cancelling a ref-declaring child now warns and
surfaces the orphaned criteria.

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

panel/lib/lifecycle.json

@@ -85,6 +85,17 @@
       "pre_side_effects": [],
       "side_effects": []
     },
+    {
+      "allowed_roles": [
+        "cell_pm",
+        "main_pm"
+      ],
+      "composes": [],
+      "description": "Stamp parent acceptance criteria onto an existing child's parent_ac_refs after the fact \u2014 for a replacement child whose delegate omitted covers_parent_criteria. No status change; the verb body owns ownership + criterion validation.",
+      "name": "declare_coverage",
+      "pre_side_effects": [],
+      "side_effects": []
+    },
     {
       "allowed_roles": [
         "cell_pm",
@@ -371,7 +382,7 @@
         "developer"
       ],
       "composes": [],
-      "description": "Rebase your task's branch onto its current base THROUGH the gate (raw git is denied). Use when your branch has fallen behind its base \u2014 e.g. a sibling task's PR merged into the parent branch while you worked. Fetches origin, rebases head onto base, and force-pushes (with-lease). No DB state change. On conflicts the rebase is aborted and the conflicted files are returned \u2014 resolve by hand, commit, then sync_branch again.",
+      "description": "Rebase your task's branch onto its current base THROUGH the gate (raw git is denied). Use when your branch has fallen behind its base \u2014 e.g. a sibling task's PR merged into the parent branch while you worked. Fetches origin, rebases head onto base, and force-pushes (with-lease). No DB state change. On conflicts the rebase is aborted and the conflicted files are returned \u2014 resolve by hand, commit, then sync_branch again. Pass stash=True to auto-stash uncommitted changes instead of refusing DIRTY_WORKSPACE; they are restored after the rebase.",
       "name": "sync_branch",
       "pre_side_effects": [],
       "side_effects": []