feat(ansible): a run's scope reads as the target or group it names

#5014 "Ansible run scope is shown as a raw id"

- inventory_gen.describe_scope / scope_labels turn "steward:target:<uuid>"
  into "target web-1", "steward:group:<uuid>" into "group Docker Swarm",
  and a deleted one into "target abcdef01 (deleted)".
- MCP run and schedule rows carry scope_label beside the stored scope; the
  ansible.run.started audit detail records it too.
- The web run page and schedules table show the name, with the stored
  scope as the tooltip.

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

steward/ansible/inventory_gen.py

@@ -106,3 +106,39 @@ async def fetch_scope_targets(db, scope: str) -> list:
 
     result = await db.execute(stmt)
     return list(result.scalars().all())
+
+
+def describe_scope(scope: str, targets: dict[str, str], groups: dict[str, str]) -> str:
+    """A run's inventory scope in words: "target web-1", "group Docker Swarm",
+    "all inventory targets", "<source>/<inventory file>". `targets` and
+    `groups` map id → name; a scope naming a deleted one says so."""
+    scope = scope or ""
+    if scope == "steward:all":
+        return "all inventory targets"
+    for prefix, kind, names in (("steward:target:", "target", targets),
+                                ("steward:group:", "group", groups)):
+        if scope.startswith(prefix):
+            ident = scope[len(prefix):]
+            name = names.get(ident)
+            return f"{kind} {name}" if name else f"{kind} {ident[:8]} (deleted)"
+    if scope.startswith("repo:"):
+        source, _, inv = scope[len("repo:"):].rpartition(":")
+        return f"{source}/{inv}" if source else inv
+    return scope
+
+
+async def scope_labels(db, scopes) -> dict[str, str]:
+    """{scope: describe_scope(scope)} for the given scopes, in two queries."""
+    from sqlalchemy import select
+    from steward.models.ansible_inventory import AnsibleGroup, AnsibleTarget
+
+    scopes = {s for s in scopes if s}
+    t_ids = {s[len("steward:target:"):] for s in scopes if s.startswith("steward:target:")}
+    g_ids = {s[len("steward:group:"):] for s in scopes if s.startswith("steward:group:")}
+    targets = dict((await db.execute(
+        select(AnsibleTarget.id, AnsibleTarget.name).where(AnsibleTarget.id.in_(t_ids))
+    )).all()) if t_ids else {}
+    groups = dict((await db.execute(
+        select(AnsibleGroup.id, AnsibleGroup.name).where(AnsibleGroup.id.in_(g_ids))
+    )).all()) if g_ids else {}
+    return {s: describe_scope(s, targets, groups) for s in scopes}