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/rendering/common.py

@@ -82,3 +82,56 @@ def print_table_rows(
   for row in rows:
     table.add_row(*[text_value(getter(row)) for _header, getter in columns])
   Console(width=terminal_width(console)).print(table)
+
+def print_browser_grouped_table_rows(
+  rows: Sequence[Row],
+  columns: Sequence[Column],
+  *,
+  console: Console,
+  empty_message: str,
+  browser_getter: Callable[[Row], CellValue | None] = lambda row: item_value(row, "browser"),
+  group_getter: Callable[[Row], CellValue | None] = lambda row: item_value(row, "browser_group", item_value(row, "browserGroup")),
+  browser_header: str = "Browser",
+  show_header: bool = True,
+  header_style: str = "bold cyan",
+) -> None:
+  """Render rows with optional local/remote browser grouping.
+
+  Rows without a browser label are rendered as a normal table. Rows with
+  ``browser_group``/``browserGroup`` get a group header (for example ``local``
+  or a remote host) and a short indented profile label below it.
+  """
+  if not rows:
+    console.print(empty_message)
+    return
+
+  show_browser = any(bool(browser_getter(row)) for row in rows)
+  if not show_browser:
+    print_table_rows(
+      rows,
+      columns,
+      console=console,
+      empty_message=empty_message,
+      show_header=show_header,
+      header_style=header_style,
+    )
+    return
+
+  table = Table(show_header=show_header, header_style=header_style)
+  table.add_column(browser_header, no_wrap=True)
+  for header, _getter in columns:
+    table.add_column(header)
+
+  rendered_groups: set[str] = set()
+  for row in rows:
+    browser = text_value(browser_getter(row))
+    group = text_value(group_getter(row))
+    if group:
+      if group not in rendered_groups:
+        table.add_row(f"[bold]{group}[/bold]", *["" for _header, _getter in columns])
+        rendered_groups.add(group)
+      browser = browser.removeprefix(f"{group}:")
+      browser = f"  {browser}"
+    table.add_row(browser, *[text_value(getter(row)) for _header, getter in columns])
+
+  Console(width=terminal_width(console)).print(table)