refactor(gateway): split data-plane files into egress/supervisor/git_gate services

Group the gateway's data-plane modules into three service sub-packages
mirroring the host-side trio (bot_bottle.egress / .supervisor / .git_gate):

  gateway/egress/     addon_core, addon, dlp_config, dlp_detectors
  gateway/supervisor/ server            (was supervise_server)
  gateway/git_gate/   render, http_backend

Prefix-stripped filenames now that the package namespaces them; each
sub-package has a thin docstring __init__ (no eager imports, cheap leaf
loads). The two cross-cutting files stay at the gateway root:
policy_resolver (shared per-client lookup) and gateway_init, renamed to
bootstrap now that gateway/ already namespaces it.

Updated all importers (bot_bottle + tests), the in-VM/container `-m`
launch strings, the Dockerfile.gateway addon shim + ENTRYPOINT, and the
five gateway entries in scripts/critical-modules.txt. Full unit suite
green (2243).

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

bot_bottle/gateway/bootstrap.py

@@ -100,8 +100,8 @@ _DAEMONS: tuple[_DaemonSpec, ...] = (
     )),
     _DaemonSpec("egress", ("/bin/sh", "/app/egress-entrypoint.sh")),
     _DaemonSpec("git-gate", ("/bin/sh", "/git-gate-entrypoint.sh")),
-    _DaemonSpec("git-http", ("python3", "-m", "bot_bottle.gateway.git_http_backend")),
-    _DaemonSpec("supervise", ("python3", "-m", "bot_bottle.gateway.supervise_server")),
+    _DaemonSpec("git-http", ("python3", "-m", "bot_bottle.gateway.git_gate.http_backend")),
+    _DaemonSpec("supervise", ("python3", "-m", "bot_bottle.gateway.supervisor.server")),
 )
 
 

bot_bottle/gateway/egress/__init__.py

@@ -0,0 +1,9 @@
+"""Gateway-side (data-plane) egress service: the mitmproxy addon and its
+pure decision core, DLP detectors, and route/DLP config parsing.
+
+These are the long-running data-plane pieces (loaded by mitmdump inside the
+`bot-bottle-gateway` image), distinct from the host-side `bot_bottle.egress`
+service that renders routes and prepares env. Import the concrete modules
+directly (`from bot_bottle.gateway.egress.addon_core import ...`) — this
+package deliberately does no eager work so leaf imports stay cheap.
+"""

bot_bottle/gateway/egress/addon.py

@@ -16,8 +16,8 @@ import typing
 from mitmproxy import http  # type: ignore[import-not-found]  # pylint: disable=import-error
 
 from bot_bottle.constants import IDENTITY_HEADER
-from bot_bottle.gateway.dlp_detectors import redact_tokens, strip_crlf
-from bot_bottle.gateway.egress_addon_core import (
+from bot_bottle.gateway.egress.dlp_detectors import redact_tokens, strip_crlf
+from bot_bottle.gateway.egress.addon_core import (
     LOG_BLOCKS,
     LOG_FULL,
     DEFAULT_OUTBOUND_ON_MATCH,

bot_bottle/gateway/egress/addon_core.py

@@ -16,11 +16,11 @@ import re
 import typing
 from dataclasses import dataclass
 
-from ..yaml_subset import YamlSubsetError, parse_yaml_subset
+from ...yaml_subset import YamlSubsetError, parse_yaml_subset
 
 # DLP detector-config parsing lives in a sibling module. Re-exported below
 # so existing `from egress_addon_core import ON_MATCH_*` callers keep working.
-from .egress_dlp_config import (
+from .dlp_config import (
     DEFAULT_OUTBOUND_ON_MATCH,
     INBOUND_DETECTOR_NAMES,
     ON_MATCH_BLOCK,

bot_bottle/gateway/egress/dlp_detectors.py

@@ -19,7 +19,7 @@ from math import log2
 from collections import Counter
 from urllib.parse import quote as url_quote
 
-from .egress_addon_core import ScanResult
+from .addon_core import ScanResult
 
 
 # ---------------------------------------------------------------------------

bot_bottle/gateway/git_gate/__init__.py

@@ -0,0 +1,7 @@
+"""Gateway-side (data-plane) git-gate service: pure host-side hook rendering
+(PRD 0008) and the smart-HTTP backend that fronts git-gate repos.
+
+The host-side git-gate service (provisioning, preflight) lives in
+`bot_bottle.git_gate`; this is the data-plane counterpart. Import the concrete
+modules directly (`from bot_bottle.gateway.git_gate.render import ...`).
+"""

bot_bottle/gateway/git_gate/render.py

@@ -14,8 +14,8 @@ import shlex
 from dataclasses import dataclass
 from pathlib import Path
 
-from ..constants import GIT_GATE_TIMEOUT_SECS, IDENTITY_HEADER
-from ..manifest import ManifestBottle, ManifestGitEntry
+from ...constants import GIT_GATE_TIMEOUT_SECS, IDENTITY_HEADER
+from ...manifest import ManifestBottle, ManifestGitEntry
 
 # Short network alias for git-gate inside the gateway. The
 # agent's `.gitconfig` insteadOf rewrites resolve through this name.

bot_bottle/gateway/supervisor/__init__.py

@@ -0,0 +1,7 @@
+"""Gateway-side (data-plane) supervise service: the supervise daemon's HTTP
+server (PRD 0013).
+
+The host-side supervise control lives in `bot_bottle.orchestrator.supervisor`;
+this is the in-gateway daemon the agents reach. Import the concrete module
+directly (`from bot_bottle.gateway.supervisor.server import ...`).
+"""

bot_bottle/gateway/supervisor/server.py

@@ -58,7 +58,7 @@ import typing
 from dataclasses import dataclass
 
 from bot_bottle.constants import IDENTITY_HEADER
-from bot_bottle.gateway.egress_addon_core import (
+from bot_bottle.gateway.egress.addon_core import (
     LOG_OFF, load_config, resolve_client_context, route_to_yaml_dict,
 )
 from bot_bottle.gateway.policy_resolver import PolicyResolveError, PolicyResolver