feat(supervise+orchestrator): slice 12 — multi-tenant git-gate hook + supervise server

Finishes the supervise data-plane writers for the shared gateway. Both
still keyed off a single SUPERVISE_BOTTLE_SLUG env; now each proposal is
attributed to the calling bottle, keeping slices 10/11's per-bottle model.

- git_http_backend: in consolidated mode stamp SUPERVISE_BOTTLE_SLUG=
  <bottle_id> into the CGI env. The gitleaks-allow pre-receive hook runs as
  a child of the `git http-backend` we spawn, so it inherits the stamp and
  queues under the right bottle — no change to the (fragile) embedded hook.
  The bottle id is the namespaced root's final component (slice 10), the
  same key egress uses. Single-tenant leaves the container-stamped slug.
- supervise_server: resolve the proposal slug per request by source IP when
  BOT_BOTTLE_ORCHESTRATOR_URL is set (`_attributed_config`), fail-closed —
  an unattributed / unreachable source raises rather than queue under the
  wrong or empty slug. `serve`/`main` build + attach the resolver and make
  the env slug optional in consolidated mode. Single-tenant unchanged.

Tests: a real git push proving the slug reaches the hook's env; the
supervise attribution matrix (single-tenant slug kept, source-IP bottle
bound, unattributed + resolver-error fail closed).

Remaining supervise gap (noted): websocket DLP still self.config-only.

pyright 0 errors; pylint 9.83/10; unit suite green (1705 tests; the 13
test_sidecar_init /bin/sleep errors are pre-existing NixOS-local noise).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck

tests/unit/test_supervise_server.py

@@ -6,6 +6,7 @@ import sys
 import tempfile
 import threading
 import time
+import types
 import unittest
 from pathlib import Path
 from unittest.mock import patch
@@ -629,5 +630,57 @@ class TestHttpEndToEnd(unittest.TestCase):
             conn.close()
 
 
+class _FakeResolver:
+    def __init__(self, bottle_id: str | None = None, raises: bool = False) -> None:
+        self._bottle_id = bottle_id
+        self._raises = raises
+        self.calls: list[str] = []
+
+    def resolve_bottle_id(self, source_ip: str, identity_token: str = "") -> str | None:
+        del identity_token
+        self.calls.append(source_ip)
+        if self._raises:
+            # Raise the exact class supervise_server catches (it imports
+            # policy_resolver flat inside the bundle, package-side in tests).
+            raise supervise_server.PolicyResolveError("orchestrator down")
+        return self._bottle_id
+
+
+def _handler(resolver: object) -> MCPHandler:
+    """A bare MCPHandler wired with a server (carrying the resolver) and a
+    client address, enough to exercise `_attributed_config` off-socket."""
+    h: MCPHandler = MCPHandler.__new__(MCPHandler)
+    h.server = types.SimpleNamespace(policy_resolver=resolver)  # type: ignore[assignment]
+    h.client_address = ("10.0.0.7", 4321)
+    return h
+
+
+class TestAttributedConfig(unittest.TestCase):
+    """Consolidated supervise: each proposal is attributed to the calling
+    bottle by source IP; single-tenant keeps the env slug (PRD 0070)."""
+
+    def test_single_tenant_keeps_env_slug(self) -> None:
+        cfg = _handler(None)._attributed_config(ServerConfig(bottle_slug="dev"))
+        self.assertEqual("dev", cfg.bottle_slug)
+
+    def test_consolidated_binds_source_ip_bottle(self) -> None:
+        r = _FakeResolver(bottle_id="bottle-x")
+        cfg = _handler(r)._attributed_config(ServerConfig(bottle_slug="ignored"))
+        self.assertEqual("bottle-x", cfg.bottle_slug)  # resolved slug wins
+        self.assertEqual(["10.0.0.7"], r.calls)
+
+    def test_unattributed_source_fails_closed(self) -> None:
+        with self.assertRaises(_RpcInternalError):
+            _handler(_FakeResolver(bottle_id=None))._attributed_config(
+                ServerConfig(bottle_slug="x")
+            )
+
+    def test_resolver_error_fails_closed(self) -> None:
+        with self.assertRaises(_RpcInternalError):
+            _handler(_FakeResolver(raises=True))._attributed_config(
+                ServerConfig(bottle_slug="x")
+            )
+
+
 if __name__ == "__main__":
     unittest.main()