fix(reasoning): 推理强度补齐 max 档，与 hermes_constants 对齐

WebUI 镜像的 VALID_REASONING_EFFORTS 此前止于 xhigh，漏了底层
hermes_constants 已有的 max 档。补齐后端常量、前端命令/下拉/帮助文本，
并同步快照测试。支持 max thinking 的 provider（如 Anthropic）现可在
composer 下拉和 /reasoning 命令中选到 Max。

CHANGELOG.md

@@ -3,6 +3,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- The reasoning-effort selector now offers a `max` level, matching the agent's `hermes_constants.VALID_REASONING_EFFORTS`. This restores parity with the underlying set (the WebUI mirror previously stopped at `xhigh`) so providers such as Anthropic that support the `max` thinking level are selectable from the composer dropdown and the `/reasoning` command.
+
 ## [v0.51.155] — 2026-05-28 — Release EA (stage-batch37 — 3-PR very low-risk cleanup: passive timeout toasts + sidecar order + subsecond timestamps)
 
 ### Fixed

api/config.py

@@ -2073,7 +2073,7 @@ def get_effective_default_model(config_data: dict | None = None) -> str:
 # Mirrors hermes_constants.parse_reasoning_effort so WebUI can validate without
 # importing from the agent tree (which may not be installed).  Any drift here
 # will show up in the shared test suite since both sides accept the same set.
-VALID_REASONING_EFFORTS = ("minimal", "low", "medium", "high", "xhigh")
+VALID_REASONING_EFFORTS = ("minimal", "low", "medium", "high", "xhigh", "max")
 
 
 def parse_reasoning_effort(effort):

static/commands.js

@@ -29,7 +29,7 @@ const COMMANDS=[
   {name:'background',desc:t('cmd_background'),fn:cmdBackground,arg:'prompt',  noEcho:true},
   {name:'status',    desc:t('cmd_status'),   fn:cmdStatus},
   {name:'voice',     desc:t('cmd_voice'),    fn:cmdVoice,     noEcho:true},
-  {name:'reasoning', desc:t('cmd_reasoning'), fn:cmdReasoning, arg:'show|hide|none|minimal|low|medium|high|xhigh', subArgs:['show','hide','none','minimal','low','medium','high','xhigh'], noEcho:true},
+  {name:'reasoning', desc:t('cmd_reasoning'), fn:cmdReasoning, arg:'show|hide|none|minimal|low|medium|high|xhigh|max', subArgs:['show','hide','none','minimal','low','medium','high','xhigh','max'], noEcho:true},
   {name:'yolo', desc:t('cmd_yolo'), fn:cmdYolo, noEcho:true},
   {name:'branch', desc:t('cmd_branch'), fn:cmdBranch, arg:'[name]', noEcho:true},
 ];
@@ -1131,13 +1131,13 @@ function cmdReasoning(args){
   const arg=(args||'').trim().toLowerCase();
   const BRAIN='\uD83E\uDDE0';
   // Matches hermes_constants.VALID_REASONING_EFFORTS + 'none' (CLI parity).
-  const EFFORTS=['none','minimal','low','medium','high','xhigh'];
+  const EFFORTS=['none','minimal','low','medium','high','xhigh','max'];
   // Shared status renderer used by the no-args branch and as a fallback.
   function _fmtStatus(st){
     const vis=(st && st.show_reasoning===false)?'off':'on';
     const eff=(st && st.reasoning_effort)||'default';
     return BRAIN+' Reasoning effort: '+eff+' \u00B7 display: '+vis
-      +'  |  /reasoning show|hide|none|minimal|low|medium|high|xhigh';
+      +'  |  /reasoning show|hide|none|minimal|low|medium|high|xhigh|max';
   }
   if(!arg){
     // Status — read from the same config.yaml keys the CLI uses.

static/index.html

@@ -715,6 +715,7 @@
             <div class="reasoning-option" data-effort="medium">Medium</div>
             <div class="reasoning-option" data-effort="high">High</div>
             <div class="reasoning-option" data-effort="xhigh">Extra High</div>
+            <div class="reasoning-option" data-effort="max">Max</div>
           </div>
           <div class="composer-toolsets-dropdown" id="composerToolsetsDropdown">
             <div class="toolsets-dropdown-desc" id="toolsetsDropdownDesc"></div>

tests/test_reasoning_show_hide.py

@@ -297,7 +297,7 @@ class TestReasoningConfigHelpers:
         # Snapshot-style assertion: if hermes_constants adds a level, this
         # test will fail fast so we know to update WebUI too.
         assert VALID_REASONING_EFFORTS == (
-            'minimal', 'low', 'medium', 'high', 'xhigh'
+            'minimal', 'low', 'medium', 'high', 'xhigh', 'max'
         )
 
     def test_set_reasoning_effort_persists_to_config_yaml(self, tmp_path, monkeypatch):