feat: M3.8.1 phase 1 — content router + log compressor

ContentRouter uses Google Magika ML for content detection (<1ms) with regex
fallback. Detects JSON, code, logs, diffs, config, text.

LogCompressor reuses M3.7.7 patterns (markers, cascade, strip_ansi) to
shrink build logs by keeping errors/stacks and dropping noise.

17 unit tests passing:
- router: json, code, diff, log, text detection
- log: error lines, stack traces, ansi stripping, compression
- optimizer: token estimation, passthrough mode

Magika + ort ONNX runtime added to Cargo.toml.

k8s/infra/databases/opensearch.yaml

@@ -285,9 +285,6 @@ data:
     opensearch.password: "admin"
     opensearch.ssl.verificationMode: none
     
-    # Dashboards index
-    opensearch_dashboards.index: ".opensearch_dashboards"
-    
     # Logging
     logging.appenders.default.type: console
     logging.appenders.default.layout.type: pattern
@@ -355,7 +352,7 @@ spec:
           # Liveness probe
           livenessProbe:
             httpGet:
-              path: /api/status
+              path: /
               port: 5601
             initialDelaySeconds: 30
             periodSeconds: 10
@@ -365,7 +362,7 @@ spec:
           # Readiness probe
           readinessProbe:
             httpGet:
-              path: /api/status
+              path: /
               port: 5601
             initialDelaySeconds: 15
             periodSeconds: 5