fix(cli): match managed prompt files by exact path

tests/unit/utils/image-analysis/claude-tool-args.test.ts

@@ -66,4 +66,17 @@ describe('appendThirdPartyImageAnalysisToolArgs', () => {
     );
     expect(fileFlags.length).toBeGreaterThanOrEqual(2);
   });
+
+  it('does not treat unrelated user prompt files as the managed CCS steering prompt', () => {
+    const result = appendThirdPartyImageAnalysisToolArgs([
+      '-p',
+      'describe',
+      '--append-system-prompt-file',
+      '/tmp/user-ccs-prompt-image-analysis-tool-notes.txt',
+    ]);
+
+    const filePaths = result.filter((arg, index) => result[index - 1] === '--append-system-prompt-file');
+    expect(filePaths).toContain('/tmp/user-ccs-prompt-image-analysis-tool-notes.txt');
+    expect(filePaths.some((filePath) => filePath.endsWith('/ccs-prompt-image-analysis-tool.txt'))).toBe(true);
+  });
 });

tests/unit/utils/prompt-injection-strategy.test.ts

@@ -1,13 +1,36 @@
-import { describe, expect, it } from 'bun:test';
+import { afterEach, beforeEach, describe, expect, it } from 'bun:test';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
 import {
-  detectPromptInjectionMode,
   buildInlineSteeringArg,
   buildFileSteeringArg,
   buildSteeringArg,
+  detectPromptInjectionMode,
+  getManagedPromptFilePath,
+  hasManagedPromptFileArg,
   PROMPT_FLAG_INLINE,
   PROMPT_FLAG_FILE,
 } from '../../../src/utils/prompt-injection-strategy';
 
+let originalCcsHome: string | undefined;
+let tempHome: string;
+
+beforeEach(() => {
+  originalCcsHome = process.env.CCS_HOME;
+  tempHome = fs.mkdtempSync(path.join(os.tmpdir(), 'ccs-prompt-strategy-'));
+  process.env.CCS_HOME = tempHome;
+});
+
+afterEach(() => {
+  if (originalCcsHome === undefined) {
+    delete process.env.CCS_HOME;
+  } else {
+    process.env.CCS_HOME = originalCcsHome;
+  }
+  fs.rmSync(tempHome, { recursive: true, force: true });
+});
+
 describe('detectPromptInjectionMode', () => {
   it('returns inline when no prompt flags present', () => {
     expect(detectPromptInjectionMode(['-p', 'hello'])).toBe('inline');
@@ -48,23 +71,47 @@ describe('buildInlineSteeringArg', () => {
 });
 
 describe('buildFileSteeringArg', () => {
-  it('returns file flag and writes temp file', () => {
-    const result = buildFileSteeringArg({promptFileName: 'ccs-test-prompt.txt', promptContent: 'hello world' });
+  it('returns file flag and writes the prompt into the isolated CCS home', () => {
+    const result = buildFileSteeringArg({
+      promptFileName: 'ccs-test-prompt.txt',
+      promptContent: 'hello world',
+    });
+
     expect(result[0]).toBe('--append-system-prompt-file');
-    expect(result[1]).toContain('ccs-test-prompt.txt');
+    expect(result[1]).toBe(path.join(tempHome, '.ccs', 'prompts', 'ccs-test-prompt.txt'));
+    expect(fs.readFileSync(result[1], 'utf8')).toBe('hello world');
+  });
+});
+
+describe('hasManagedPromptFileArg', () => {
+  it('returns true for the exact CCS-managed prompt path', () => {
+    expect(
+      hasManagedPromptFileArg({
+        args: [PROMPT_FLAG_FILE, getManagedPromptFilePath('ccs-test')],
+        promptName: 'ccs-test',
+      })
+    ).toBe(true);
+  });
+
+  it('returns false for unrelated user files that only contain the prompt name', () => {
+    expect(
+      hasManagedPromptFileArg({
+        args: [PROMPT_FLAG_FILE, '/tmp/user-ccs-test-notes.txt'],
+        promptName: 'ccs-test',
+      })
+    ).toBe(false);
   });
 });
 
 describe('buildSteeringArg', () => {
   it('delegates to inline in inline mode', () => {
-    expect(buildSteeringArg({
-      args: [PROMPT_FLAG_INLINE],
-      promptName: 'ignored.txt',
-      promptContent: 'hello',
-    })).toEqual([
-      '--append-system-prompt',
-      'hello',
-    ]);
+    expect(
+      buildSteeringArg({
+        args: [PROMPT_FLAG_INLINE],
+        promptName: 'ignored.txt',
+        promptContent: 'hello',
+      })
+    ).toEqual(['--append-system-prompt', 'hello']);
   });
 
   it('delegates to file in file mode', () => {
@@ -74,6 +121,6 @@ describe('buildSteeringArg', () => {
       promptContent: 'hello',
     });
     expect(result[0]).toBe('--append-system-prompt-file');
-    expect(result[1]).toContain('ccs-test.txt');
+    expect(result[1]).toBe(getManagedPromptFilePath('ccs-test'));
   });
 });

tests/unit/utils/websearch/claude-tool-args.test.ts

@@ -157,4 +157,16 @@ describe('appendThirdPartyWebSearchToolArgs', () => {
     expect(fileFlags.length).toBeGreaterThanOrEqual(2);
     expect(result).not.toContain('--append-system-prompt');
   });
+
+  it('does not treat unrelated user prompt files as the managed CCS steering prompt', () => {
+    const result = appendThirdPartyWebSearchToolArgs([
+      'smoke',
+      '--append-system-prompt-file',
+      '/tmp/user-ccs-prompt-websearch-tool-notes.txt',
+    ]);
+
+    const filePaths = result.filter((arg, index) => result[index - 1] === '--append-system-prompt-file');
+    expect(filePaths).toContain('/tmp/user-ccs-prompt-websearch-tool-notes.txt');
+    expect(filePaths.some((filePath) => filePath.endsWith('/ccs-prompt-websearch-tool.txt'))).toBe(true);
+  });
 });