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/agent.go

@@ -420,6 +420,18 @@ func (a *agent) chatWith(ctx context.Context, sessionID, message, systemInject s
 			return
 		}
 
+		// P3: persist intermediate reasoning. When the model produces text
+		// AND tool calls in the same iteration, the text is its reasoning
+		// before the tool calls — the operator saw it live via text_delta,
+		// but without emitting it as a `text` event here, the persist layer
+		// (main.go/continue.go) never captures it and a reload shows only
+		// the final summary + a flat tool-call list, not the thinking that
+		// led to each step. Emitting it lets the persist layer accumulate
+		// per-iteration reasoning into the row's text field.
+		if strings.TrimSpace(msg.Content) != "" {
+			emit(agentEvent{Type: "text", Data: msg.Content, SessionID: sessionID})
+		}
+
 		slog.Info("nomos: tool calls", "count", len(msg.ToolCalls), "iter", i+1, "correlation", correlationID)
 
 		messages = append(messages, msg.ToParam())