Merge events and commands into one Activity feed, and lead with live state

Two changes to the PC page, both about what a responder meets first.

LIVE STATE FIRST. The contributed panels moved to the head of the card flow.
The grid is a two-column FLOW (column-count, with display:contents on the
column wrappers), so a card cannot be pinned to a side and only document order
decides where it lands - putting the panels first fills the left column with
endpoint status, services, processes, interfaces and activity, and leaves
identity, hardware, network and location to the right. Panels still self-order
among themselves by declared position and still self-hide when no plugin
answers for the asset type.

ONE ACTIVITY FEED replaces the Recent events card. Events and commands answer
the same question - what happened to this box - and reading them as two lists
meant interleaving by eye. GET /api/endpoints/asset/<id>/activity merges them
newest-first, capped at 15. Both are keyed by assetid, so it is two indexed
reads and a merge sort rather than a join, and it renders through the existing
ADR-010 list renderer with no bespoke frontend work. A failed command is marked
critical, because that is the row somebody needs to notice. Not collapsed by
default, unlike the card it replaces.

The core AuditLog is deliberately NOT a third source: its rows carry the action
as the entity name and the asset only inside a details string, so including it
would mean parsing prose to find out which machine a row belongs to.

Requester names are withheld from callers who cannot themselves issue commands,
via caller_holds. A read-only viewer - a guest, on a site that grants this
panel - gets the history without a roster of who restarted what, and the lookup
is skipped entirely rather than fetched and discarded. requestedby holds a user
ID, so names resolve through one batched query, not one per row.

Verified on dev telemetry: a queued command shows as 'Collect now / Pending by
admin' above the Windows events, ordered by time.

Full suite 2124 passed, vitest 260 passed, naming/contract/parity gates green,
spec regenerated at 332 paths.

plugins/endpoints/api/routes.py

@@ -18,7 +18,7 @@ from shopdb.api import (
     ErrorCodes, get_pagination_params, paginate_query, require_permission,
     require_role, caller_holds, mint_service_token, list_service_tokens,
     revoke_service_tokens,
-    AuditLog, collector_authorized,
+    AuditLog, collector_authorized, User,
 )
 
 from ..models import EndpointState, EndpointEvent, EndpointCommand
@@ -490,6 +490,84 @@ def panel_recent_events(asset_id: int):
     return success_response(rows)
 
 
+@endpoints_bp.route('/asset/<int:asset_id>/activity', methods=['GET'])
+@require_permission('endpoints.view')
+def panel_activity(asset_id: int):
+    """List panel: one chronological feed of what happened to this endpoint.
+
+    Curated Windows events and operator commands merged and sorted newest
+    first. They answer the same question - what happened to this box - and
+    reading them as two separate cards means interleaving them by eye.
+
+    Both sources are already keyed by assetid, so this is two indexed reads and
+    a merge sort, not a join. The core AuditLog is deliberately NOT a third
+    source: its rows carry the action as the entity name and the asset only
+    inside a details string, so pulling it in would mean parsing prose.
+
+    The requester's name is withheld from callers who cannot themselves issue
+    commands. A read-only viewer - a guest, on a site that grants this panel -
+    has no need for the roster of who restarted what, and the feed is just as
+    useful without it.
+    """
+    naming = caller_holds('endpoints.command')
+
+    events = (EndpointEvent.query
+              .filter_by(assetid=asset_id)
+              .order_by(EndpointEvent.eventtime.desc())
+              .limit(15)
+              .all())
+
+    commands = (EndpointCommand.query
+                .filter_by(assetid=asset_id)
+                .order_by(EndpointCommand.createdat.desc())
+                .limit(15)
+                .all())
+
+    # requestedby holds a user ID, not a name. One batched lookup rather than a
+    # query per row, and only when the caller is allowed to see the names at all.
+    names = {}
+    if naming:
+        userids = {c.requestedby for c in commands if c.requestedby}
+        if userids:
+            names = {u.userid: (u.username or '')
+                     for u in User.query.filter(User.userid.in_(userids)).all()}
+
+    rows = []
+    for event in events:
+        rows.append({
+            'title': event_title(event.eventid),
+            'severity': event_severity(event.eventid),
+            'detail': 'Windows event {}'.format(event.eventid),
+            'eventtime': event.eventtime,
+        })
+
+    for command in commands:
+        label = COMMAND_ALLOWLIST.get(command.action, {}).get('label') or command.action
+        target = ' on {}'.format(command.target) if command.target else ''
+        who = ''
+        if naming and command.requestedby:
+            username = names.get(command.requestedby)
+            if username:
+                who = ' by {}'.format(username)
+        rows.append({
+            'title': '{}{}'.format(label, target),
+            # A failed command is the one an operator needs to notice.
+            'severity': 'critical' if command.status == EndpointCommand.STATUS_FAILED else 'info',
+            'detail': '{}{}'.format((command.status or 'queued').title(), who),
+            'eventtime': command.createdat,
+        })
+
+    # Undated rows sort last rather than crashing the comparison.
+    rows.sort(key=lambda r: (r['eventtime'] is not None, r['eventtime']), reverse=True)
+
+    return success_response([{
+        'title': r['title'],
+        'severity': r['severity'],
+        'detail': r['detail'],
+        'eventtime': r['eventtime'].isoformat() + 'Z' if r['eventtime'] else None,
+    } for r in rows[:15]])
+
+
 @endpoints_bp.route('/asset/<int:asset_id>/interfaces', methods=['GET'])
 @require_permission('endpoints.view')
 def panel_interfaces(asset_id: int):