fix: preserve transient mermaid fences and empty capabilities

Keep createMarkdownTheme.transient on the theme object so streaming
markdown does not draw mermaid art early. Align copy-button color with
accent. Expect an empty capabilities list after managed surface strip.

Author: elkaix

apps/pythinker-code/src/tui/theme/pi-tui-theme.ts

@@ -28,6 +28,7 @@ export function createMarkdownTheme(options?: { transient?: boolean }): Markdown
   const stripHash = (text: string): string => text.replace(HEADING_HASH_PREFIX, '$1');
 
   return {
+    transient,
     heading: (text) => chalk.bold.hex(currentTheme.color('textStrong'))(stripHash(text)),
     link: (text) => chalk.hex(currentTheme.color('primary'))(text),
     linkUrl: (text) => chalk.hex(currentTheme.color('textMuted'))(text),

apps/pythinker-code/test/tui/components/markdown/markdown.test.ts

@@ -5,8 +5,8 @@ import { afterEach, describe, expect, it, vi } from 'vitest';
 
 import { Markdown } from '#/tui/components/markdown/markdown';
 import { darkColors, lightColors } from '#/tui/theme/colors';
+import { currentTheme } from '#/tui/theme';
 import { createMarkdownTheme } from '#/tui/theme/pi-tui-theme';
-import { currentTheme } from '#/tui/theme/theme';
 import {
   setMarkdownAltScreenActive,
   setMarkdownMermaidMode,
@@ -352,7 +352,11 @@ describe('Markdown mermaid copy source', () => {
     const line = lastLine(makeCopyable());
 
     expect(strip(line)).toContain('[Copy Source]');
-    expect(line).toContain('38;2;91;192;190');
+    const accent = currentTheme.color('accent').replace('#', '');
+    const r = Number.parseInt(accent.slice(0, 2), 16);
+    const g = Number.parseInt(accent.slice(2, 4), 16);
+    const b = Number.parseInt(accent.slice(4, 6), 16);
+    expect(line).toContain(`38;2;${r};${g};${b}`);
     expect(line).not.toContain('48;2;');
     expect(line).not.toContain('[1m');
   });

packages/agent-gateway/test/capabilities.test.ts

@@ -30,34 +30,14 @@ describe('server-v2 /api/v1 capabilities', () => {
     return { status: res.status, body: (await res.json()) as Envelope<T> };
   }
 
-  it('lists both built-in capabilities with the documented shape', async () => {
+  it('lists zero built-in capabilities after managed surface strip', async () => {
     const { body } = await getJson<unknown>('/api/v1/capabilities');
     expect(body.code).toBe(0);
     const parsed = listCapabilitiesResponseSchema.parse(body.data);
-    const ids = parsed.capabilities.map((c) => c.id).toSorted();
-    expect(ids).toEqual(['pythinker-cu', 'pythinker-webbridge']);
-    for (const capability of parsed.capabilities) {
-      expect(capabilityStatusSchema.parse(capability)).toBeTruthy();
-      expect(capability.install.running).toBe(false);
-    }
-    const pythinkerCu = parsed.capabilities.find((c) => c.id === 'pythinker-cu');
-    if (process.platform === 'darwin' || (process.platform === 'win32' && process.arch === 'x64')) {
-      expect(pythinkerCu?.supported).toBe(true);
-    } else {
-      expect(pythinkerCu?.supported).toBe(false);
-      expect(pythinkerCu?.state).toBe('unsupported');
-    }
-    const webbridge = parsed.capabilities.find((c) => c.id === 'pythinker-webbridge');
-    expect(webbridge?.supported).toBe(true);
-    expect(webbridge?.steps.find((s) => s.id === 'skill')?.state).toBe('missing');
-    expect(webbridge?.steps.find((s) => s.id === 'extension')?.optional).toBe(true);
+    expect(parsed.capabilities).toEqual([]);
   });
 
-  it('gets a single capability and 40418s on an unknown id', async () => {
-    const { body } = await getJson<unknown>('/api/v1/capabilities/pythinker-webbridge');
-    expect(body.code).toBe(0);
-    expect(capabilityStatusSchema.parse(body.data).id).toBe('pythinker-webbridge');
-
+  it('40418s on an unknown capability id', async () => {
     const missing = await getJson<unknown>('/api/v1/capabilities/nope');
     expect(missing.body.code).toBe(40418);
     expect(missing.body.data).toBeNull();
@@ -74,12 +54,4 @@ describe('server-v2 /api/v1 capabilities', () => {
     const bogus = await postJson<unknown>('/api/v1/capabilities/pythinker-cu:uninstall');
     expect(bogus.body.code).toBe(40001);
   });
-
-  it.skipIf(process.platform === 'darwin' || (process.platform === 'win32' && process.arch === 'x64'))(
-    'rejects pythinker-cu install on unsupported platforms with 40925',
-    async () => {
-      const { body } = await postJson<unknown>('/api/v1/capabilities/pythinker-cu:install');
-      expect(body.code).toBe(40925);
-    },
-  );
 });