fix(#2565): route generate-claude-profile target through runtime policy (#2659)

* test(#2565): add failing regression for generate-claude-profile runtime target

cmdGenerateClaudeProfile hardcodes .claude/CLAUDE.md (project + global),
ignoring the runtime policy that #3163 wired into the sibling
cmdGenerateClaudeMd handler. These tests pin the parity contract for
project scope (codex -> AGENTS.md, env precedence, --output override,
claude preserved), global scope (codex -> <CODEX_HOME>/AGENTS.md, claude
preserved), and a divergence guard asserting both handlers agree on the
project instruction path for the same runtime.

Failing-first: all seven tests reproduce the bug on unmodified next.

* fix(#2565): route generate-claude-profile target through runtime policy

cmdGenerateClaudeProfile hardcoded .claude/CLAUDE.md for both project and
global scope, ignoring the runtime-aware resolution that #3163 wired into
the sibling cmdGenerateClaudeMd handler. The #3163 fix diverged when it did
not propagate here, so /gsd-profile-user kept writing Claude instruction
files on Codex installs (and other AGENTS-native runtimes: opencode, kilo,
kimi, antigravity, copilot).

Fix mirrors the proven #3163 pattern using existing policy primitives:
- Project scope resolves through getProjectInstructionFile(runtime) and a
  non-claude runtime wins over a stale claude_md_path (AGENTS-native
  projects must never write to CLAUDE.md).
- Global scope derives ~/.<config-home>/<instruction-basename> via
  getGlobalConfigDir + basename(getProjectInstructionFile), so codex lands
  at ~/.codex/AGENTS.md. Claude global is preserved byte-for-byte (no
  env-var drift beyond the prior hardcoded path).
- GSD_RUNTIME env var takes precedence over config.runtime.

A parity test asserts both handlers agree on the project instruction path
for the same runtime, guarding against future re-divergence
(CLAUDE.md 'Generative Fix Divergence' rule).

* docs(#2565): add changeset fragment for generate-claude-profile runtime fix

* docs(#2565): remove parenthetical product description from changeset

The product-name purity guard (#1777) flags 'ProductName (description)'
patterns in changeset fragments because the prose renders verbatim into
CHANGELOG.md at release time. The original fragment had 'Codex (and other
AGENTS-native runtimes)' in the bold header, which matched the banned
pattern. Reworded to drop the parenthetical; also trimmed the per-runtime
mapping (belongs in code comments, not changelog prose).

* docs(#2565): backfill PR number in changeset fragment

* test(#2565): isolate os.homedir() cross-platform in claude global test

The 'global scope: claude runtime writes to ~/.claude/CLAUDE.md' test set
only HOME to redirect os.homedir() at a tmpDir. On Windows, Node's
os.homedir() reads USERPROFILE (not HOME), so the child process still
resolved the real user profile and the path assertion failed (#2659 CI).
Set USERPROFILE alongside HOME so the isolation holds on both POSIX and
Windows. Production code is unchanged — it uses os.homedir() exactly as
the prior hardcoded path did.

src/profile-output.cts

@@ -1028,20 +1028,52 @@ function cmdGenerateClaudeProfile(cwd: string, options: CmdGenerateClaudeProfile
 
   const sectionContent = sectionLines.join('\n');
 
+  // #2565: resolve target through effective runtime policy instead of
+  // hardcoded .claude/CLAUDE.md. Mirrors the #3163 fix applied to
+  // cmdGenerateClaudeMd above; that fix diverged when it didn't propagate
+  // here, leaving /gsd-profile-user writing Claude files on Codex installs.
+  // - Project scope: getProjectInstructionFile(runtime) is the single source
+  //   of truth (AGENTS.md for codex/opencode/kilo/kimi/unknown; GEMINI.md for
+  //   antigravity; .github/copilot-instructions.md for copilot).
+  // - Global scope: ~/.<config-home>/<instruction-basename>, derived from
+  //   getGlobalConfigDir + basename(getProjectInstructionFile), so codex lands
+  //   at ~/.codex/AGENTS.md. Claude global is preserved byte-for-byte (no
+  //   env-var drift beyond the prior hardcoded path).
+  // - GSD_RUNTIME env var takes precedence over config.runtime (mirrors the
+  //   #3163 env-precedence contract). Non-claude always wins over a stale
+  //   claude_md_path (#3163 rationale: an AGENTS-native project must never
+  //   write to CLAUDE.md even if a prior Claude setup left claude_md_path).
+  let config: Record<string, unknown> = {};
+  try {
+    config = loadConfig(cwd);
+  } catch { /* use defaults */ }
+  const effectiveRuntime = resolveRuntimeNameFromCandidates(
+    process.env['GSD_RUNTIME'],
+    config['runtime'],
+  );
+  const isClaudeRuntime = !effectiveRuntime || effectiveRuntime === 'claude';
+
   let targetPath: string;
   if (options.global) {
-    targetPath = path.join(os.homedir(), '.claude', 'CLAUDE.md');
+    if (isClaudeRuntime) {
+      targetPath = path.join(os.homedir(), '.claude', 'CLAUDE.md');
+    } else {
+      targetPath = path.join(
+        getGlobalConfigDir(effectiveRuntime),
+        path.basename(getProjectInstructionFile(effectiveRuntime)),
+      );
+    }
   } else if (options.output) {
     targetPath = path.isAbsolute(options.output) ? options.output : path.join(cwd, options.output);
   } else {
-    // Read claude_md_path from config; #1098 default is ./.claude/CLAUDE.md
+    // Read claude_md_path from config; #1098 default is .claude/CLAUDE.md
     // (kept consistent with cmdGenerateClaudeMd so the profile section and the
     // managed sections land in the same file on a config-less project).
-    let configClaudeMdPath = './.claude/CLAUDE.md';
-    try {
-      const config = loadConfig(cwd);
-      if (config['claude_md_path']) configClaudeMdPath = config['claude_md_path'] as string;
-    } catch { /* use default */ }
+    let configClaudeMdPath = '.claude/CLAUDE.md';
+    if (config['claude_md_path']) configClaudeMdPath = config['claude_md_path'] as string;
+    if (!isClaudeRuntime) {
+      configClaudeMdPath = getProjectInstructionFile(effectiveRuntime);
+    }
     targetPath = path.isAbsolute(configClaudeMdPath) ? configClaudeMdPath : path.join(cwd, configClaudeMdPath);
   }