feat(agent): plan-first gate, iterative follow-ups, reasoning persistence

P1 plan-first: run handler refuses without propose_plan (structural gate,
not SOUL.md prose). Plan window decoupled from set_goal — config_mutation
auto-run only on operator approval (assent window). Closes the approval-free
config_mutation hole confirmed in session d0d562e0.

P2 iteration: reopenSession flips terminal→executing, marks prior plan steps
replaced, clears outcome. proposePlan excludes replaced from in-flight check,
bumps generation. A follow-up on a completed session starts a new sub-task
with a fresh plan — no more errPlanInFlight dead end.

P3 reasoning: accumulate per-iteration text into the persisted row instead
of overwriting with the last text event. Reload shows intermediate thinking,
not just the final summary.

P4 read-only allowlist: add find, tree, locate, systemctl list-timers/
list-unit-files/show, timedatectl, hostnamectl, systemd-analyze, rclone
ls/lsl/md5sum/check/cryptcheck. Fixes the find misclassification from
d0d562e0.

P5 eval harness: new assertion kinds (proposes_plan, plan_before_run,
plan_generations), multi-turn followups, fetch /sessions/{id}/plan. Four
manifests under evals/.

P6 SOUL.md: strip degenerate-case carve-out, add ITERATE step, update
set_goal guidance.

VERSION 0.6.0 → 0.7.0

cmd/nomos/continue.go

@@ -247,6 +247,10 @@ func (a *agent) resumeSession(ctx context.Context, sessionID, note string) {
 			}
 		}
 		toolCalls, finalText, errText = nil, "", ""
+		// P3: accumulate per-iteration reasoning instead of overwriting
+		// (same fix as main.go's chat handler). Without this, a resumed
+		// turn's intermediate thinking is lost on reload.
+		var textParts []string
 		emit := func(ev agentEvent) {
 			if ev.Type == "tool_use" || ev.Type == "tool_result" {
 				if m, ok := ev.Data.(map[string]any); ok {
@@ -272,7 +276,11 @@ func (a *agent) resumeSession(ctx context.Context, sessionID, note string) {
 				persist() // live: a poller sees this step land within seconds
 			}
 			if ev.Type == "text" {
-				finalText, _ = ev.Data.(string)
+				if t, ok := ev.Data.(string); ok && t != "" {
+					textParts = append(textParts, t)
+					finalText = strings.Join(textParts, "\n\n")
+					persist()
+				}
 			}
 			if ev.Type == "error" {
 				errText, _ = ev.Data.(string)