feat(observability): restore monitoring coverage, make gaps visible, stream executions

Monitoring coverage was 3 of 89 active entities. Three bugs, each hidden by
discarded errors in checkdefaults:

- writeCheck generated a fresh uuid, inserted the check entity ON CONFLICT
  (slug) DO NOTHING, then wrote a check_defs row referencing it. On any
  re-seed the slug already existed, the entity insert no-oped, and the FK
  violated — aborting the ingest transaction and surfacing as an unrelated
  failure several entities later. Re-seeding has been broken since; prod's
  coverage was frozen at its first successful seed. This is what
  TestSeedIngestIdempotentAndNoDuplicateEdges had been reporting.
- shortSlug truncated to the last 8 chars, so all 21 ingress routes collapsed
  to ".network" and overwrote each other; service:jellyfin collided with
  lxc:jellyfin.
- The ssh-script checker never read the `args` config checkdefaults wrote, so
  process_check.sh always ran without its unit name and returned "unknown".

Coverage is now 75/89. Monitoring is declared per entity type in
seeds/ontology.yaml and resolved through the is-a hierarchy, so a type can say
it warrants nothing (site, lan, mesh, cluster) and never be reported as a gap.
coverageSweep raises an `unmonitored` signal only where a type declares
monitoring it lacks — 8 real gaps, no false positives.

Also:
- entity_types.attribute_schema was never ingested: the seed loader read
  "attribute_schema" but the YAML says "attributes", so all 60 types stored
  JSON null.
- ListExecutions ignored its declared target/action/correlation_id filters and
  paginated on a non-unique target slug, dropping and repeating rows.
- started_at was captured but only written at terminal state, so a running
  execution reported NULL for its whole life. The three MCP auto-run copies
  wrote no timing at all; they are now one autoRun helper.
- SSH output was buffered to completion and discarded entirely on timeout.
  Both sshExec copies now stream through a shared execlog sink into
  execution_logs, and keep partial output when a command is cancelled.
- executions.correlation_id was a random per-execution uuid that correlated
  nothing; it is now the chat session id, which is what lets the chat tail
  live output.
- reversible_low had no auto-run branch despite policy declaring it
  unattended. Since computeCommandRisk never returns it, the class only arises
  when an agent declares it over a read_only command — so gating it penalised
  candor without adding safety.
- backup-target gains a backup-freshness checker (portable find -mmin, since
  the first target is on macOS), resolving its host by walking backs-up-to
  backwards. The pre-deploy pg_dump is now a tracked backup target.

UI: an Executions section on entity detail with live output tailing, and
streamed output under a running `run` call in the chat timeline.

Migrations 022-024. Ops.svelte and context.ts exclude execution.output from
their refetch triggers, which would otherwise fire once a second per command.

Co-Authored-By: Claude <noreply@anthropic.com>

internal/checkdefaults/defaults_test.go

@@ -0,0 +1,125 @@
+package checkdefaults
+
+import (
+	"testing"
+)
+
+// The attribute shapes here are copied from seeds/inventory.yaml. The original
+// resolveHost looked for lan_ip / mesh.netbird.ip / mesh_ip, none of which a
+// service or workstation actually carries — which is why 86 of 89 entities
+// ended up with no checks.
+func TestResolveHostAcceptsRealSeedShapes(t *testing.T) {
+	cases := []struct {
+		desc  string
+		attrs map[string]any
+		want  string
+	}{
+		{"lxc carries lan_ip", map[string]any{"lan_ip": "192.168.8.246"}, "192.168.8.246"},
+		{
+			"ws:mac-mini carries only a netbird fqdn",
+			map[string]any{"mesh": map[string]any{"netbird": map[string]any{
+				"fqdn": "mac-mini-234-17.netbird.selfhosted"}}},
+			"mac-mini-234-17.netbird.selfhosted",
+		},
+		{
+			"a netbird ip still wins over the fqdn",
+			map[string]any{"mesh": map[string]any{"netbird": map[string]any{
+				"ip": "100.122.0.10", "fqdn": "x.netbird.selfhosted"}}},
+			"100.122.0.10",
+		},
+		{"public_host as a last resort", map[string]any{"public_host": "media.hubris.network"}, "media.hubris.network"},
+		{"a service carries no address at all", map[string]any{
+			"url": "https://media.hubris.network", "port": 8096}, ""},
+		{"nil attrs", nil, ""},
+	}
+
+	for _, c := range cases {
+		if got := resolveHost(c.attrs); got != c.want {
+			t.Errorf("%s: resolveHost = %q, want %q", c.desc, got, c.want)
+		}
+	}
+}
+
+func TestHTTPURLPrefersAttributeThenName(t *testing.T) {
+	cases := []struct {
+		desc  string
+		name  string
+		attrs map[string]any
+		want  string
+	}{
+		{"explicit url wins", "jellyfin",
+			map[string]any{"url": "https://media.hubris.network"}, "https://media.hubris.network"},
+		{"public_host becomes https", "jellyfin",
+			map[string]any{"public_host": "media.hubris.network"}, "https://media.hubris.network"},
+		// Ingress routes carry the hostname as the entity name and usually
+		// declare no attributes at all.
+		{"hostname-shaped name", "media.hubris.network", nil, "https://media.hubris.network"},
+		{"a bare service name is not a hostname", "jellyfin", nil, ""},
+	}
+
+	for _, c := range cases {
+		got := httpURL(Target{Name: c.name}, c.attrs)
+		if got != c.want {
+			t.Errorf("%s: httpURL = %q, want %q", c.desc, got, c.want)
+		}
+	}
+}
+
+func TestBuildKindReportsWhyItSkipped(t *testing.T) {
+	// A declared kind that cannot be built must explain itself rather than
+	// vanish — that silence is what hid the coverage gap.
+	if defs, reason := buildKind(KindPing, Target{}, nil, "", "root", 22); len(defs) != 0 || reason == "" {
+		t.Errorf("ping without a host should skip with a reason, got %d defs / %q", len(defs), reason)
+	}
+	if defs, reason := buildKind(KindProcess, Target{Name: ""}, nil, "10.0.0.1", "root", 22); len(defs) != 0 || reason == "" {
+		t.Errorf("process without a name should skip with a reason, got %d defs / %q", len(defs), reason)
+	}
+	if defs, reason := buildKind("dns", Target{}, nil, "10.0.0.1", "root", 22); len(defs) != 0 || reason == "" {
+		t.Errorf("an unimplemented kind should skip with a reason, got %d defs / %q", len(defs), reason)
+	}
+}
+
+func TestBuildKindProcessPassesTheUnitName(t *testing.T) {
+	// process_check.sh reads $1 and answers "no service name provided"
+	// without it. checkdefaults always wrote args; nothing read them.
+	defs, reason := buildKind(KindProcess, Target{Name: "jellyfin"}, nil, "10.0.0.1", "root", 22)
+	if len(defs) != 1 {
+		t.Fatalf("expected one process check, got %d (%s)", len(defs), reason)
+	}
+	if got := defs[0].config["args"]; got != "jellyfin" {
+		t.Errorf("process check args = %v, want jellyfin", got)
+	}
+	if got := defs[0].config["script"]; got != "process_check.sh" {
+		t.Errorf("process check script = %v", got)
+	}
+}
+
+func TestBuildKindHTTPUsesAStatusRangeNotAnExactCode(t *testing.T) {
+	// Most services sit behind Authentik and answer 302/401.
+	defs, _ := buildKind(KindHTTP, Target{Name: "jellyfin"},
+		map[string]any{"url": "https://media.hubris.network"}, "", "root", 22)
+	if len(defs) != 1 {
+		t.Fatalf("expected one http check, got %d", len(defs))
+	}
+	if got := defs[0].config["max_status"]; got != 500 {
+		t.Errorf("max_status = %v, want 500", got)
+	}
+	if _, exact := defs[0].config["expected_status"]; exact {
+		t.Error("default http checks must not pin an exact status")
+	}
+}
+
+func TestBuildKindResourceExpandsToFourScripts(t *testing.T) {
+	defs, _ := buildKind(KindResource, Target{}, nil, "10.0.0.1", "root", 22)
+	if len(defs) != 4 {
+		t.Fatalf("resource should expand to 4 checks, got %d", len(defs))
+	}
+	for _, d := range defs {
+		if d.kind != "ssh-script" {
+			t.Errorf("resource check kind = %q, want ssh-script", d.kind)
+		}
+		if d.config["host"] != "10.0.0.1" {
+			t.Errorf("resource check lost its host: %v", d.config)
+		}
+	}
+}