Give each endpoint its own credential and fix the review findings on the server

Per-PC credentials (replaces the 09-14 client-certificate attempt):
- POST /api/endpoints/enroll issues a credential to a PC that matches exactly
  one computer by hostname and BIOS serial and has none yet. Anything else
  (unknown or duplicate hostname, serial mismatch, already enrolled) waits as
  a request an admin approves or rejects. The agent's persisted nonce binds an
  approved request to the PC that asked.
- One auth helper serves every agent route. With X-Endpoint-Credential the
  asset comes from the credential and a request naming another PC gets 403
  ASSET_MISMATCH. The shared key still works for PCs that have not enrolled,
  is refused (401 SHARED_KEY_REFUSED) for any PC that has, and can be switched
  off. A revoked credential gets 401 CREDENTIAL_INVALID so the agent
  re-enrolls.
- The core collector accepts the credential for the computers, printers and
  endpoints collectors through two new plugin hooks exposed on shopdb.api
  (contract 0.33.0), and refuses the shared key for enrolled PCs.
- Admin API: enrollment list, approve, reject, revoke (un-enroll), settings.
  Migration API: per-PC readiness with blockers, and upgrade waves that
  package the agent once and queue the existing agent upgrade per PC.
- Migration 0023 creates endpointcredentials, endpointenrollrequests and
  endpointmigrationwaves, drops the certificate columns from assets where
  test databases have them, and renames app_fingerprint to appfingerprint.
  0021 and 0022 keep their ids but no longer alter the core assets table.
- Removed: client_cert.py, certificate renewal, the unauthenticated
  /test/client-cert route, nginx client certificate forwarding and the agent
  certificate script. The client-cert header could be forged on IIS, the key
  was readable by users, and the shared key remained a fallback.
- GET /settings/server-cert returns the SPKI SHA-256 pin for GE-Enforce.

Review fixes:
- report_command_result used g without importing it; every result was a 500.
- collect_log refuses setup answer files, appsettings, agent directories and
  key files at enqueue.
- Fleet alerts: alerttimeout and alertfleet agree with the migration, the
  scope is validated and a malformed scope no longer reaches the whole fleet,
  and the ack race no longer raises NameError.
- A refused break-glass override leaves no hold and no audit row.
- Agent upgrade checks locks and permissions before repackaging, and writes
  the package atomically.
- Server certificate upload validates the pair before replacing files;
  generation no longer builds an openssl config from user input; audit rows
  are actually written.
- Health evaluation runs in a savepoint so a caught error cannot lose the
  check-in.
- Required-app policies are found by appid, survive renames, and deleting an
  app deactivates policies that still name it. The UI and API now say such a
  policy only takes effect inside a business policy.
- Backfill handles duplicate fingerprints and rolls back a failed batch.
- Plugin settings routes skip a plugin whose hook raises.
- The setup token is no longer printed to the log.
- The naming gate checks top-level files again and handles odd file names.
- Removed root scratch scripts, one of which carried a token.
- Rewrote the fleet alert scheduling and app delta tests on real fixtures.

shopdb/plugins/alembic_template.py

@@ -58,7 +58,9 @@ PLUGIN_TABLE_OWNERS: dict[str, Iterable[str]] = {
                       'endpointapplications', 'endpointmonitors',
                       'operatorreports', 'endpointhealthstates',
                       'endpointhealthtransitions', 'endpointmonitorimpacts',
-                      'endpointlocks', 'endpointlogcollections'),
+                      'endpointlocks', 'endpointlogcollections',
+                      'endpointcredentials', 'endpointenrollrequests',
+                      'endpointmigrationwaves'),
     'geenforce':     ('manifestscopes', 'manifestentries', 'manifestentrypctypes',
                       'manifestentryhostnames', 'manifestentrymachinenumbers',
                       'manifestinusechecks', 'manifestinusecheckprocesses',

shopdb/plugins/base.py

@@ -236,6 +236,27 @@ class BasePlugin(ABC):
             f"implement apply_collector_payload"
         )
 
+    def resolve_agent_credential(self, secret: str) -> Optional[int]:
+        """Asset id for an active per-PC agent credential, else None.
+
+        Optional (contract 0.33.0). A plugin that issues endpoint credentials
+        answers here so the generic collector can accept them on any schema
+        declaring 'acceptsagentcredential'. Called via
+        shopdb.api.resolve_agent_credential, which asks enabled plugins and
+        takes the first non-None answer.
+        """
+        return None
+
+    def agent_shared_key_refused(self, hostname: str) -> bool:
+        """True when the shared collector key may not report for this hostname.
+
+        Optional (contract 0.33.0). True when the shared key is switched off or
+        the hostname's asset holds an active per-PC credential. Called via
+        shopdb.api.agent_shared_key_refused, which is True if any enabled
+        plugin says so.
+        """
+        return False
+
     def on_install(self, app: Flask) -> None:
         """Called when plugin is installed via CLI."""
         pass