feat: group multi-browser output by source

- Add browser source grouping metadata to SDK-created tabs, groups,
  list results, and aggregate count results.
- Render grouped local/remote browser tables consistently for clients,
  tabs, groups, windows, sessions, and remote status output.
- Document remote control, auth, HTTP gateway usage, and the refreshed
  project structure in the README.
- Add coverage for grouped output and BrowserCounts browser_groups.
- Bump the Python package, extension manifest, and lockfile to 0.15.6.
- Add a just publish helper for building and publishing release artifacts.

browser_cli/commands/remote.py

@@ -8,6 +8,7 @@ from rich.table import Table
 
 from browser_cli import BrowserCLI
 from browser_cli.commands import handle_errors
+from browser_cli.commands.rendering import print_browser_grouped_table_rows
 from browser_cli.remote.registry import REMOTE_REGISTRY_PATH, load_remotes, save_remote_key
 
 console = Console()
@@ -23,14 +24,23 @@ def remote_group():
 def remote_status(endpoint, key):
     """Probe a remote endpoint and show server/client status."""
     client = BrowserCLI(remote=endpoint, key=key)
-    clients = client.clients()
-    table = Table(show_header=True, header_style="bold cyan")
-    table.add_column("Profile")
-    table.add_column("Browser")
-    table.add_column("Extension")
-    for item in clients:
-        table.add_row(str(item.get("profile", "")), str(item.get("name", "")), str(item.get("extensionVersion", "")))
-    console.print(table)
+    clients = [
+        {**item, "profileLabel": item.get("profile", ""), "profileGroup": endpoint}
+        for item in client.clients()
+    ]
+    columns = [
+        ("Browser", lambda item: item.get("name", "")),
+        ("Extension", lambda item: item.get("extensionVersion", "")),
+    ]
+    print_browser_grouped_table_rows(
+        clients,
+        columns,
+        console=console,
+        empty_message="[yellow]No browser clients found[/yellow]",
+        browser_getter=lambda item: item.get("profileLabel", ""),
+        group_getter=lambda item: item.get("profileGroup", ""),
+        browser_header="Profile",
+    )
 
 @remote_group.command("trust")
 @click.argument("endpoint")