feat(go): report integrity anchor context

docs/GO_PORT_HANDOFF.md

@@ -1,8 +1,8 @@
 # Go Port Handoff
 
-Saved: 2026-07-22T02:48:00-07:00
+Saved: 2026-07-22T03:00:00-07:00
 Branch: `main`
-Base commit: `6355fb4` (`feat(go): expose retained incident views`)
+Base commit: `88d7a6e` (`feat(go): enrich snapshots with package ownership`)
 Status: implemented and green, but uncommitted
 
 ## Worktree warning
@@ -12,8 +12,8 @@ continuations. Do not reset, clean, or broadly restage it.
 
 - The validation-sidecar, incident-persistence, bounded-enrichment, local-
   assurance, asynchronous-enrichment, and incident-reader tranches are signed
-  commits `f85c2e8`, `538d1d9`, `fd2bbba`, `1ab4add`, `eff31b3`, and
+  commits `f85c2e8`, `538d1d9`, `fd2bbba`, `1ab4add`, `eff31b3`, `6355fb4`,
-  `6355fb4`. The package-ownership enrichment slice is uncommitted.
+  and `88d7a6e`. The integrity-anchor enrichment slice is uncommitted.
 - At this checkpoint, `git status --short` has 20 entries with untracked
   directories collapsed.
 - The Python GUI files and tests are separate pre-existing work. Preserve them
@@ -106,7 +106,10 @@ static binary.
 - The asynchronous worker now resolves pacman/dpkg/rpm package-owner strings
   with a two-second bound and cache; ownership lookup never holds a detector
   lock or blocks alert capture.
-- Richer integrity anchors and notification fan-out are not yet ported.
+- The worker now reports FIM-baseline, package-DB-anchor, and Go hash-chain
+  presence/age. It explicitly marks package verification and rootcheck disabled
+  until their actual engines are ported.
+- Richer integrity engines and notification fan-out are not yet ported.
 - `--incidents-list` and `--incident-show <id>` now read the sidecar's isolated
   state without starting the agent. The latter returns `enodia.incident.view.v1`
   with the incident, available snapshots, and time-ordered timeline.
@@ -154,8 +157,9 @@ the suite still exits successfully.
 
 ## Resume here
 
-1. Add bounded integrity-anchor collectors to the existing asynchronous worker
+1. Port the actual FIM/package-verification/rootcheck engines behind explicit,
-   without destructive response behavior.
+   bounded acceptance gates; do not treat enrichment anchor status as detection
+   parity.
 2. Add a read-only management API consumer for isolated Go snapshot/event state
    while keeping Python authoritative.
 3. Continue broader Phase 3 rule metadata/state parity before considering any

go-agent/README.md

@@ -119,7 +119,10 @@ from already-captured data without new I/O. A 16-job asynchronous worker then
 adds streamed SHA-256 values for regular executables up to 8 MiB, file metadata,
 and pacman/dpkg/rpm package-owner strings with a two-second query bound;
 saturation leaves fields unknown rather than delaying alerts. Richer integrity
-anchors and notifications remain future parity work. Snapshot text/JSON
+engines and notifications remain future parity work. The worker does report
+truthful FIM-baseline, package-DB-anchor, and Go hash-chain presence/age while
+explicitly marking unported package verification and rootcheck as disabled.
+Snapshot text/JSON
 revisions append synchronized `enodia.hash_chain.v1`
 records to a private local `hash-chain.jsonl`.
 

go-agent/internal/enrich/enrich.go

@@ -10,10 +10,12 @@ import (
 	"encoding/hex"
 	"io"
 	"os"
+	"path/filepath"
 	"regexp"
 	"sort"
 	"strings"
 	"syscall"
+	"time"
 
 	"codeberg.org/anassaeneroi/enodia-sentinal/go-agent/internal/model"
 	"codeberg.org/anassaeneroi/enodia-sentinal/go-agent/internal/netutil"
@@ -45,6 +47,7 @@ type Process struct {
 type SlowResult struct {
 	Processes map[int]map[string]any
 	Files     map[string]map[string]any
+	Integrity map[string]any
 }
 
 func CollectSlow(processes []Process, paths []string, owner ...func(string) string) SlowResult {
@@ -68,6 +71,31 @@ func CollectSlow(processes []Process, paths []string, owner ...func(string) stri
 	return result
 }
 
+// IntegrityAnchors reports durable state presence without running FIM, package
+// verification, or rootcheck on the alert path. Those engines stay disabled
+// until their own Go parity tranches land.
+func IntegrityAnchors(directory string) map[string]any {
+	return map[string]any{
+		"fim_baseline":   pathStatus(filepath.Join(directory, "fim-baseline.json")),
+		"pkgdb_anchor":   pathStatus(filepath.Join(directory, "pkgdb-anchor.json")),
+		"package_verify": map[string]any{"enabled": false, "sample": 0},
+		"rootcheck":      map[string]any{"enabled": false, "interval": 0},
+		"go_assurance":   pathStatus(filepath.Join(directory, "hash-chain.jsonl")),
+	}
+}
+
+func pathStatus(path string) map[string]any {
+	info, err := os.Stat(path)
+	if err != nil {
+		return map[string]any{"path": path, "status": "missing", "age": nil}
+	}
+	age := int64(time.Since(info.ModTime()).Seconds())
+	if age < 0 {
+		age = 0
+	}
+	return map[string]any{"path": path, "status": "present", "age": age}
+}
+
 func boundedHash(path string) any {
 	info, err := os.Stat(path)
 	if err != nil || !info.Mode().IsRegular() || info.Size() > MaxHashBytes {

go-agent/internal/enrich/enrich_test.go

@@ -74,3 +74,19 @@ func TestCollectSlowAddsInjectedPackageOwnership(t *testing.T) {
 		t.Fatalf("result=%#v", result)
 	}
 }
+
+func TestIntegrityAnchorsAreTruthfulAndReadOnly(t *testing.T) {
+	directory := t.TempDir()
+	anchors := IntegrityAnchors(directory)
+	if anchors["fim_baseline"].(map[string]any)["status"] != "missing" ||
+		anchors["rootcheck"].(map[string]any)["enabled"] != false {
+		t.Fatalf("anchors=%#v", anchors)
+	}
+	if err := os.WriteFile(filepath.Join(directory, "hash-chain.jsonl"), []byte("{}\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	anchors = IntegrityAnchors(directory)
+	if anchors["go_assurance"].(map[string]any)["status"] != "present" {
+		t.Fatalf("anchors=%#v", anchors)
+	}
+}

go-agent/internal/snapshot/store.go

@@ -291,6 +291,7 @@ func (s *Store) applySlowEnrichment(job slowJob) {
 	processes := enrichmentProcesses(report.Processes)
 	paths := enrichmentPaths(report.Enrichment)
 	updates := enrich.CollectSlow(processes, paths, provenance.PackageOwner)
+	updates.Integrity = enrich.IntegrityAnchors(s.Dir)
 
 	// All slow I/O has completed. Take the lock only to merge into the newest
 	// same-second report, so a concurrent alert capture never loses evidence.
@@ -361,6 +362,9 @@ func mergeSlow(report *Report, updates enrich.SlowResult) {
 			}
 		}
 	}
+	if updates.Integrity != nil {
+		report.Enrichment["integrity"] = updates.Integrity
+	}
 }
 
 func nullToNil(value any) any {

go-agent/internal/snapshot/store_test.go

@@ -171,6 +171,11 @@ func TestSlowEnrichmentAddsBoundedHashAndFileMetadata(t *testing.T) {
 	if file["exists"] != true || file["mode"] != float64(0o600) {
 		t.Fatalf("file enrichment=%#v", file)
 	}
+	integrity := report.Enrichment["integrity"].(map[string]any)
+	if integrity["go_assurance"].(map[string]any)["status"] != "present" ||
+		integrity["rootcheck"].(map[string]any)["enabled"] != false {
+		t.Fatalf("integrity enrichment=%#v", integrity)
+	}
 	logRaw, err := os.ReadFile(filepath.Join(store.Dir, "alert-20260722-101112.log"))
 	if err != nil || !strings.Contains(string(logRaw), "ENODIA SENTINEL ALERT") {
 		t.Fatalf("slow log err=%v text=%q", err, logRaw)