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

internal/policy/command.go

@@ -69,11 +69,13 @@ var destructivePatterns = []*regexp.Regexp{
 var readOnlyLeadPattern = regexp.MustCompile(
 	`^(cat|less|head|tail|ls|stat|file|du|df|free|uptime|uname|hostname|whoami|id|ip|ss|netstat|ping|` +
 		`journalctl|dmesg|ps|top|htop|env|printenv|echo|which|whereis|` +
-		`grep|egrep|fgrep|rg|wc|sort|uniq|cut|tr|tee|` +
+		`grep|egrep|fgrep|rg|wc|sort|uniq|cut|tr|tee|find|tree|locate|` +
 		`dpkg\s+(-l|-s|--list|--status)\b|apt\s+(list|search|show)\b|` +
-		`systemctl\s+(status|is-active|is-enabled|is-failed|list-units)|` +
+		`systemctl\s+(status|is-active|is-enabled|is-failed|list-units|list-unit-files|list-timers|show)\b|` +
+		`timedatectl|hostnamectl|systemd-analyze|` +
 		`docker\s+(ps|images|inspect|logs|version|info|stats)|` +
 		`pct\s+(status|config|list)|qm\s+(status|config|list)|pvesh\s+get|` +
+		`rclone\s+(ls|lsl|md5sum|check|cryptcheck)\b|` +
 		`git\s+(status|log|diff|show|branch|remote)|` +
 		`curl\s+-.*-I\b|curl\s+.*--head\b)\b`)