Reduce resume OOM risk and fix update-config skill init (#304)

* Reduce resume transcript memory pressure

* Fix update-config bundled skill schema generation

---------

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

src/skills/bundled/updateConfig.test.ts

@@ -0,0 +1,23 @@
+import { afterEach, expect, test } from 'bun:test'
+
+import { clearBundledSkills, getBundledSkills } from '../bundledSkills.js'
+import { registerUpdateConfigSkill } from './updateConfig.js'
+
+afterEach(() => {
+  clearBundledSkills()
+})
+
+test('update-config skill can generate its prompt without JSON Schema conversion errors', async () => {
+  registerUpdateConfigSkill()
+
+  const skill = getBundledSkills().find(command => command.name === 'update-config')
+  expect(skill).toBeDefined()
+  expect(skill?.type).toBe('prompt')
+
+  const blocks = await skill!.getPromptForCommand('', {} as never)
+  expect(blocks.length).toBeGreaterThan(0)
+  expect(blocks[0]).toMatchObject({ type: 'text' })
+  expect((blocks[0] as { text: string }).text).toContain(
+    '## Full Settings JSON Schema',
+  )
+})