Move .claude creation for testing agent harness to postinstall

.gitignore

@@ -48,21 +48,16 @@ test/aml/out
 .playwright-mcp/
 
 # Chat customizations
+.claude/
 .agents/agents/*.local.md
-.claude/agents/*.local.md
 .github/agents/*.local.md
 .agents/agents/*.local.agent.md
-.claude/agents/*.local.agent.md
 .github/agents/*.local.agent.md
 .agents/hooks/*.local.json
-.claude/hooks/*.local.json
 .github/hooks/*.local.json
 .agents/instructions/*.local.instructions.md
-.claude/instructions/*.local.instructions.md
 .github/instructions/*.local.instructions.md
 .agents/prompts/*.local.prompt.md
-.claude/prompts/*.local.prompt.md
 .github/prompts/*.local.prompt.md
 .agents/skills/.local/
-.claude/skills/.local/
 .github/skills/.local/

script/postinstall.ts

@@ -92,9 +92,33 @@ async function copyCopilotCLIFolders(sourceDir: string, targetDir: string) {
 	await fs.promises.cp(sourceDir, targetDir, { recursive: true, force: true });
 }
 
+/**
+ * Creates symlinks so that `.claude/` mirrors canonical locations (for testing Claude Agent harness):
+ *   .claude/CLAUDE.md  →  .github/copilot-instructions.md
+ *   .claude/skills     →  .agents/skills
+ */
+async function createClaudeSymlinks() {
+	console.log('Creating symlinks for Claude session storage and instructions...');
+	const claudeDir = path.join(REPO_ROOT, '.claude');
+	await fs.promises.mkdir(claudeDir, { recursive: true });
+
+	const symlinks: { link: string; target: string }[] = [
+		{ link: path.join(claudeDir, 'CLAUDE.md'), target: path.join('..', '.github', 'copilot-instructions.md') },
+		{ link: path.join(claudeDir, 'skills'), target: path.join('..', '.agents', 'skills') },
+	];
+
+	for (const { link, target } of symlinks) {
+		if (!fs.existsSync(link)) {
+			await fs.promises.symlink(target, link);
+		}
+	}
+}
+
 async function main() {
 	await fs.promises.mkdir(path.join(REPO_ROOT, '.build'), { recursive: true });
 
+	await createClaudeSymlinks();
+
 	const vendoredTiktokenFiles = ['src/platform/tokenizer/node/cl100k_base.tiktoken', 'src/platform/tokenizer/node/o200k_base.tiktoken'];
 
 	for (const tokens of vendoredTiktokenFiles) {