feat: spirit engine — seance WS, entity minting/Codex, Piper TTS voices, wire telemetry

- WS /ws/session: modes, summon, anomaly fragments, streaming direct contact,
  passive wire-ghost ambient loop, per-user rate limits, event transcript
- entities: anomaly-signature fingerprinting, LLM minting + procedural
  fallback, Codex matching with contact counts and sightings
- tts: 8 local Piper voices (EN/ES), per-entity voice profiles, numpy
  effects chain (pitch/rate/bitcrush/echo/static)
- llm: streaming client, submit_stream in bounded queue, SpiritService
  with offline fallbacks for every channel
- routes: public /api/codex, /api/codex/{id}, /api/stats; /audio static mount
- models: Entity, EntitySighting, Event, ContactSession(entity_id, language)

backend/tests/test_telemetry.py

@@ -0,0 +1,19 @@
+from app.telemetry import parse_proc_net_dev
+
+PROC_NET_DEV = """Inter-|   Receive                                                |  Transmit
+ face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
+    lo: 1234567    1000    0    0    0     0          0         0  1234567    1000    0    0    0     0       0          0
+  eth0: 9876543    5000    0    0    0     0          0         0  1111111    4000    0    0    0     0       0          0
+"""
+
+
+def test_parse_proc_net_dev_extracts_counters():
+    counters = parse_proc_net_dev(PROC_NET_DEV)
+    assert counters == {
+        "lo": (1234567, 1234567),
+        "eth0": (9876543, 1111111),
+    }
+
+
+def test_parse_proc_net_dev_ignores_malformed_lines():
+    assert parse_proc_net_dev("garbage\nno colon here\n") == {}