feat(settings): add a tool approval mode with an explicit off (YOLO) option (#6304)

* feat: add optional tool approval mode

Admin-configurable tool_approval_mode setting (ask/auto) for the
post-external-context tool approval gate.

- ask (default): existing approval flow, gate stays on
- auto: bypasses the approval gate for all runs - same effect as
  ODYSSEUS_TOOL_APPROVAL_GATE=0. Documented honestly in the settings
  row copy and in THREAT_MODEL.md, per review on #6304.
- value validated server-side ({ask, auto}, anything else -> 400)
- no new env var: the setting wires to the existing gate control
- tests: setting validation + _tool_approval_gate_bypassed behavior

* feat: surface deployment gate state on Tool approval row

Follow-up to StressTestor's re-review: when ODYSSEUS_TOOL_APPROVAL_GATE is
set to a falsy value, the Tool approval row still read 'Always ask' even though
the gate was off, misleading admins the other way.

GET /api/auth/settings now returns tool_approval_gate_env_disabled (derived
from TOOL_APPROVAL_GATE_ENABLED) for admins, and the settings row renders a
red notice naming the env var and explaining that the gate is off for every
run regardless of the stored setting. Non-admin/scrubbed responses do not
expose the deployment state. Test covers both env values and the scrub path.

* refactor: rename tool approval mode auto to off

The gate-off value is now "off" ("Off (YOLO)" in the UI) so the auto-approve name stays available for the future judged mode.

---------

Co-authored-by: Matej <matej@local>

static/js/settings/agent.js

@@ -10,6 +10,7 @@ export async function initAgentSettings() {
   var toolsInput = el('set-agentMaxTools');
   var roundsInput = el('set-agentMaxRounds');
   var supInput = el('set-agentSupervisorLadder');
+  var approvalModeInput = el('set-toolApprovalMode');
   var msg = el('set-agentMsg');
   if (!toolsInput) return;
 
@@ -19,6 +20,21 @@ export async function initAgentSettings() {
     if (settings.agent_max_tool_calls) toolsInput.value = settings.agent_max_tool_calls;
     if (roundsInput && settings.agent_max_rounds) roundsInput.value = settings.agent_max_rounds;
     if (supInput) supInput.checked = !!settings.agent_supervisor_ladder;
+    if (approvalModeInput) {
+      approvalModeInput.value =
+        settings.tool_approval_mode === 'off' ? 'off' : 'ask';
+    }
+    var approvalEnvNote = el('set-toolApprovalEnvNote');
+    if (approvalEnvNote) {
+      if (settings.tool_approval_gate_env_disabled) {
+        approvalEnvNote.textContent =
+          'Forced by deployment: ODYSSEUS_TOOL_APPROVAL_GATE is set to a falsy value on this server, so the approval gate is off for every run regardless of this setting.';
+        approvalEnvNote.style.display = 'block';
+      } else {
+        approvalEnvNote.textContent = '';
+        approvalEnvNote.style.display = 'none';
+      }
+    }
   } catch (e) {}
 
   // Clamp + coerce a raw input to an int in [lo, hi]; falls back to `dflt`
@@ -37,6 +53,10 @@ export async function initAgentSettings() {
     var payload = { agent_max_tool_calls: tools };
     if (rounds != null) payload.agent_max_rounds = rounds;
     if (supInput) payload.agent_supervisor_ladder = !!supInput.checked;
+    if (approvalModeInput) {
+      payload.tool_approval_mode =
+        approvalModeInput.value === 'off' ? 'off' : 'ask';
+    }
     try {
       await _postSettings(payload);
       msg.textContent = (tools > 0 ? 'Limit: ' + tools + ' tool calls' : 'Unlimited tool calls') +
@@ -49,6 +69,7 @@ export async function initAgentSettings() {
   toolsInput.addEventListener('change', save);
   if (roundsInput) roundsInput.addEventListener('change', save);
   if (supInput) supInput.addEventListener('change', save);
+  if (approvalModeInput) approvalModeInput.addEventListener('change', save);
   var cur = parseInt(toolsInput.value, 10) || 0;
   var curR = roundsInput ? (parseInt(roundsInput.value, 10) || 20) : null;
   msg.textContent = (cur > 0 ? 'Limit: ' + cur + ' tool calls' : 'Unlimited tool calls') +