refactor: convert project from bash to Python

Replaces cli.sh + lib/*.sh with a claude_bottle/ Python package and a
cli.py entry point. No external dependencies — uses only Python's
stdlib (json, subprocess, getpass, tempfile, argparse, re, etc.).

- claude_bottle/{log,docker,manifest,env_resolve,network,pipelock,
  skills,ssh,cli}.py mirror the previous lib/*.sh modules.
- Tests converted to unittest under tests/test_*.py with a stdlib
  runner at tests/run_tests.py (unit | integration | path).
- .githooks/commit-msg ported to Python; same Conventional Commits rules.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_pipelock_classify.py

@@ -0,0 +1,33 @@
+"""Unit: is_ipv4_literal — the classifier that decides whether
+bottle.ssh[].Hostname goes into ssrf.ip_allowlist (IPv4 literal) or
+trusted_domains (hostname)."""
+
+import unittest
+
+from claude_bottle.pipelock import is_ipv4_literal
+
+
+class TestIPv4Classify(unittest.TestCase):
+    def test_positive(self):
+        for ip in ("127.0.0.1", "10.0.0.5", "100.78.141.42", "0.0.0.0", "255.255.255.255"):
+            with self.subTest(ip=ip):
+                self.assertTrue(is_ipv4_literal(ip), ip)
+
+    def test_negative(self):
+        for hn in (
+            "github.com",
+            "gitea.dideric.is",
+            "100.78.141",
+            "100.78.141.42.5",
+            "::1",
+            "fe80::1",
+            "localhost",
+            "",
+            "1.2.3.4.example.com",
+        ):
+            with self.subTest(hn=hn):
+                self.assertFalse(is_ipv4_literal(hn), hn)
+
+
+if __name__ == "__main__":
+    unittest.main()