Limit auto-mode classifier transcript growth (#277)

* Limit auto-mode classifier transcript growth

* Release persisted tool results from transcript state

---------

Co-authored-by: pr0ln <pr0ln@pr0lnui-Macmini.local>

src/utils/permissions/yoloClassifier.test.ts

@@ -0,0 +1,79 @@
+import { describe, expect, test } from 'bun:test'
+
+import { buildTranscriptForClassifier } from './yoloClassifier.js'
+
+const tools = [
+  {
+    name: 'Bash',
+    aliases: [],
+    toAutoClassifierInput(input: Record<string, unknown>) {
+      return String(input.command ?? '')
+    },
+  },
+] as any
+
+describe('buildTranscriptForClassifier', () => {
+  test('keeps the most recent transcript entries within budget', () => {
+    const messages = [
+      {
+        type: 'user',
+        message: {
+          content: 'old-user',
+        },
+      },
+      {
+        type: 'assistant',
+        message: {
+          content: [
+            {
+              type: 'tool_use',
+              name: 'Bash',
+              input: { command: 'old-tool' },
+            },
+          ],
+        },
+      },
+      {
+        type: 'user',
+        message: {
+          content: 'new-user',
+        },
+      },
+      {
+        type: 'assistant',
+        message: {
+          content: [
+            {
+              type: 'tool_use',
+              name: 'Bash',
+              input: { command: 'new-tool' },
+            },
+          ],
+        },
+      },
+    ] as any
+
+    const transcript = buildTranscriptForClassifier(messages, tools, 32)
+
+    expect(transcript).toContain('new-user')
+    expect(transcript).toContain('new-tool')
+    expect(transcript).not.toContain('old-user')
+    expect(transcript).not.toContain('old-tool')
+  })
+
+  test('truncates oversized user blocks before serialization', () => {
+    const messages = [
+      {
+        type: 'user',
+        message: {
+          content: 'x'.repeat(40_000),
+        },
+      },
+    ] as any
+
+    const transcript = buildTranscriptForClassifier(messages, tools)
+
+    expect(transcript.length).toBeLessThan(33_000)
+    expect(transcript).toContain('[truncated ')
+  })
+})