feat: audit log, usage tracking UI, OpenAI orchestrator compaction, onboarding + docs

Tool audit log:
- Every orchestrator tool call logged to home/{user}/tool_audit/YYYY-MM-DD.jsonl
- Files panel sidebar: audit log group (collapsed), date-linked read-only table
- Admin endpoints: /api/audit/files, /api/audit/day, /api/audit/recent, /api/audit/stats
- Engine and model name recorded per entry

OpenAI orchestrator improvements:
- Context budget enforcement: 75% of model context_k (min 16k)
- Message compaction: truncates old tool results when approaching budget
- max_rounds respected per model config (intersected with server cap)

OpenRouter onboarding (setup.html, onboarding.py, app.js, settings.html):
- Step 3 of 3: /setup/model with curated model picker
- Chat banner for users on server-default model (informational, not alarmist)
- Settings quick-link card; /setup/model works standalone for existing users

Model registry + session store:
- set_role_config / get_role_config for per-role tool lists and system_append
- session_store: session rename, session name backfill endpoint

UI updates (app.js, index.html, style.css, local_llm.html):
- Role toggle in context panel
- Off-the-record mode
- Agent notes read-only viewer
- OPERATIONS.md loaded at T2+ in context

Documentation:
- HELP.md: full tool table, per-role tool sets, Agent Notes, usage tracking
- TOOLS.md: Agent Notes section, count corrected to 44
- ARCH__SYSTEM.md, ARCH__BACKENDS.md, MASTER.md updated to match reality
- CLAUDE.md: onboarding flow, documentation philosophy sections
- README.md: stack in practice, DeepSeek TUI mention, architecture diagram updated
- TODO__Agents.md: onboarding task completed with deviation notes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cortex/static/local_llm.html

@@ -167,9 +167,11 @@
     .pb-anthropic { background: #1e1b4b; color: #818cf8; }
     .pb-google    { background: #042f2e; color: #34d399; }
     .pb-local     { background: #1e293b; color: #64748b; }
+    .pb-notools   { background: #3b1a1a; color: #f87171; }
     [data-theme="light"] .pb-anthropic { background: #ede9fe; color: #5b21b6; }
     [data-theme="light"] .pb-google    { background: #d1fae5; color: #065f46; }
     [data-theme="light"] .pb-local     { background: #e2e8f0; color: #475569; }
+    [data-theme="light"] .pb-notools   { background: #fee2e2; color: #b91c1c; }
 
     /* Host & model rows */
     .host-row {
@@ -488,8 +490,22 @@
                    autocomplete="off" data-form-type="other">
           </div>
           <div class="field" style="flex:0 0 auto">
-            <label>Context (k tokens)</label>
-            <input type="number" id="add-context-k" name="context_k" value="0" min="0" max="10000">
+            <label title="Context window size in thousands of tokens. 0 = assume 32k.">Context (k tokens)</label>
+            <input type="number" id="add-context-k" name="context_k" value="0" min="0" max="10000"
+                   title="Context window size in thousands of tokens. 0 = assume 32k (compaction budget ~24k tokens).">
+          </div>
+          <div class="field" style="flex:0 0 auto">
+            <label title="Per-model tool loop cap. 0 = use the global default (orchestrator_max_rounds).">Max rounds</label>
+            <input type="number" name="max_rounds" value="0" min="0"
+                   title="Per-model tool loop cap. 0 = use the global default (orchestrator_max_rounds).">
+          </div>
+          <div class="field" style="flex:0 0 auto">
+            <label title="Whether this model supports tool calling. If not supported, requests skip the tool loop entirely.">Tool calling</label>
+            <select name="tools"
+                    title="Whether this model supports tool calling. If not supported, requests skip the tool loop entirely.">
+              <option value="1" selected>Supported</option>
+              <option value="0">Not supported</option>
+            </select>
           </div>
         </div>
         <div class="field">