feat(2): Q4.2 mumble — parity port (health/protocol-handshake/web) + 2 specific + P4 sqlite

- functional/_mumble_proto.py: stdlib Mumble TLS protocol client (adapted from corpus mumble_connect.py)
- 3 parity ports: test_tcp_health, test_protocol_handshake (channel presence+ServerSync), test_web_client
- 2 NEW recipe-specific (P3): welcome-text + max-users config round-trips over the protocol
- P4: ops.py + test_backup/test_restore seed ci_marker in /data/mumble-server.sqlite (recipe's own backupbot DB), busy_timeout for live-server locks
- test_install overlay: voice server listening on 64738 (beyond web-sidecar readiness)
- recipe_meta: COMPOSE_FILE=compose.yml:mumbleweb:host-ports; WELCOME_TEXT/USERS markers
- PARITY.md mapping table

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/mumble/recipe_meta.py

@@ -0,0 +1,31 @@
+# Per-recipe harness config for mumble (Phase 2 Q4.2 — a TCP/voice recipe, not HTTP-native).
+#
+# Mumble's voice server speaks its own TLS protocol on 64738 (no HTTP API). To fit cc-ci's
+# HTTP-readiness + on-host test model we deploy two recipe overlays:
+#   - compose.mumbleweb.yml  -> a mumble-web HTTP client routed through Traefik on the app domain,
+#     giving the generic harness a real HTTP readiness/serving signal (HEALTH_PATH "/") AND the
+#     web_client.py parity surface.
+#   - compose.host-ports.yml -> publishes 64738 (tcp+udp) directly on the cc-ci host (mode: host).
+#     Tests run on-host (cc-ci-run), so the protocol tests connect to 127.0.0.1:64738.
+# Both overlays are shipped by the upstream recipe; this is a documented deployment mode, not a fork.
+#
+# Distinctive config markers (read back by the recipe-specific functional tests, proving our config
+# actually propagated into the running server — version-independent, not hard-coded upstream values):
+#   WELCOME_TEXT -> MUMBLE_CONFIG_WELCOMETEXT, surfaced in the ServerSync welcome_text.
+#   USERS        -> MUMBLE_CONFIG_USERS (max users), surfaced in the ServerConfig.max_users.
+
+HEALTH_PATH = "/"          # mumble-web client UI
+HEALTH_OK = (200,)
+DEPLOY_TIMEOUT = 900       # two images to pull (mumble-server + mumble-web) on a cold node
+HTTP_TIMEOUT = 300
+
+# A unique, stable welcome-text marker the round-trip test asserts surfaces over the protocol.
+WELCOME_TEXT_MARKER = "cc-ci-mumble-welcome-7f3a9c"
+# A distinctive max-users value (not the recipe default 100) the server_config test asserts.
+MAX_USERS = 42
+
+EXTRA_ENV = {
+    "COMPOSE_FILE": "compose.yml:compose.mumbleweb.yml:compose.host-ports.yml",
+    "WELCOME_TEXT": WELCOME_TEXT_MARKER,
+    "USERS": str(MAX_USERS),
+}