refactor(cli): group subcommand handlers under cli/commands/

Move the eleven per-command modules (backend, cleanup, commit, edit,
info, init, list, login, resume, start, supervise) into a new
bot_bottle/cli/commands/ package, leaving the dispatcher (__init__),
entrypoint (__main__), and shared helpers (_common, tui) at the cli
root. Makes the command surface obvious at a glance and separates
handlers from the plumbing that registers them.

Updated the dispatcher's COMMANDS imports to .commands.*, bumped the
moved files' relative-import depths (.._common, .. import tui, sibling
.start unchanged), and repointed test references to
bot_bottle.cli.commands.*. Full unit suite green (2243); CLI dispatch
verified via `python -m bot_bottle.cli --help`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bot_bottle/cli/commands/commit.py

@@ -0,0 +1,53 @@
+"""commit: freeze a running bottle's state to a resumable artifact.
+
+Docker bottles are committed to a local Docker image. Macos-container
+bottles are exported and rebuilt as a local Apple Container image.
+Firecracker bottles stream the guest rootfs out over SSH and rebuild a
+local Docker image. The resulting reference is stored in per-bottle
+state so the next `./cli.py resume <slug>` boots from the snapshot
+instead of rebuilding from the Dockerfile.
+"""
+
+from __future__ import annotations
+
+import argparse
+
+from ...backend import enumerate_active_agents
+from ...backend.freeze import CommitCancelled, get_freezer
+from ...bottle_state import read_metadata
+from ...log import die
+from .._common import PROG
+from .. import tui
+
+
+def cmd_commit(argv: list[str]) -> int:
+    parser = argparse.ArgumentParser(prog=f"{PROG} commit", add_help=True)
+    parser.add_argument(
+        "slug",
+        nargs="?",
+        default=None,
+        help=(
+            "bottle slug from `cli.py list active` "
+            "(omit to pick interactively)"
+        ),
+    )
+    args = parser.parse_args(argv)
+
+    slug = args.slug
+    if slug is None:
+        active = enumerate_active_agents()
+        if not active:
+            die("no active bottles; start one with `./cli.py start`")
+        choices = [a.slug for a in active]
+        slug = tui.filter_select(choices, title="Select bottle to commit")
+        if slug is None:
+            return 0
+
+    metadata = read_metadata(slug)
+    backend = metadata.backend if metadata else ""
+
+    try:
+        get_freezer(backend).commit_slug(slug)
+    except CommitCancelled:
+        return 0
+    return 0