feat(go): port FIM/pkgdb/rootcheck integrity engines and add go-sidecar dashboard consumer

Adds sidecar-only, --state-dir-gated FIM, package-DB-anchor, and rootcheck
engines to the Go migration sidecar, wired into agent.Sweep/Initialize
behind the existing baseline lifecycle. Adds a read-only, schema-checked
Python dashboard consumer (go_sidecar_state_dir, /api/go-sidecar/*, Sidecar
tab) that never starts, stops, or mutates the Go sidecar's state.

Also fixes drift found while reconciling this work: enodia_sentinel/web.py
had reinvented local schema constants instead of using the canonical
enodia_sentinel/schemas.py catalog (now registers enodia.go.sidecar.v1
there and reuses ALERT_SNAPSHOT_V1/INCIDENT_V1); docs/RULES.md had drifted
from what `rules docs` actually generates for SIDs 100069-100078 (ruleops.py
was missing metadata for four SIDs and had stale drill text for four more),
now back in sync with a regression test pinning them together.

Updates CLAUDE.md, README.md, go-agent/README.md, and docs/{ROADMAP,
GO_PORT_HANDOFF,SURICATA_ASSIMILATION,THREAT_MODEL,OPERATIONS,SCHEMAS,
COMMAND_REFERENCE}.md to reflect the landed work.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NQivSKBqQJsayz1xcYqWzZ

enodia_sentinel/config.py

@@ -173,6 +173,11 @@ class Config:
     web_token: str = ""              # bearer token; auto-generated if empty + non-local
     web_tls_cert: str = ""           # "" = auto-generate self-signed cert under log_dir
     web_tls_key: str = ""            # "" = auto-generate private key under log_dir
+    # Optional, read-only Go validation-sidecar evidence tree. This must stay
+    # separate from log_dir so the Python daemon remains the production source
+    # of truth and the dashboard never mistakes migration evidence for Python
+    # alert state.
+    go_sidecar_state_dir: str = ""
 
     # paths
     log_dir: Path = Path("/var/log/enodia-sentinel")