chore: merge main, resolve VERSION + CHANGELOG conflicts

Keep v0.15.9.0 (our branch) above v0.15.8.1 (main). Both entries preserved.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -19,6 +19,22 @@ You can now connect gstack to OpenClaw as a methodology source. OpenClaw spawns
 - OpenClaw host config updated: generates only 4 native skills instead of all 31. Removed staticFiles.SOUL.md (referenced non-existent file).
 - Setup script now prints redirect message for `--host openclaw` instead of attempting full installation.
 
+## [0.15.8.1] - 2026-04-05 — Community PR Triage + Error Polish
+
+Closed 12 redundant community PRs, merged 2 ready PRs (#798, #776), and expanded the friendly OpenAI error to every design command. If your org isn't verified, you now get a clear message with the right URL instead of a raw JSON dump, no matter which design command you run.
+
+### Fixed
+
+- **Friendly OpenAI org error on all design commands.** Previously only `$D generate` showed a user-friendly message when your org wasn't verified. Now `$D evolve`, `$D iterate`, `$D variants`, and `$D check` all show the same clear message with the verification URL.
+
+### Added
+
+- **>128KB regression test for Codex session discovery.** Documents the current buffer limitation so future Codex versions with larger session_meta will surface cleanly instead of silently breaking.
+
+### For contributors
+
+- Closed 12 redundant community PRs (6 Gonzih security fixes shipped in v0.15.7.0, 6 stedfn duplicates). Kept #752 open (symlink gap in design serve). Thank you @Gonzih, @stedfn, @itstimwhite for the contributions.
+
 ## [0.15.8.0] - 2026-04-04 — Smarter Reviews
 
 Code reviews now learn from your decisions. Skip a finding once and it stays quiet until the code changes. Specialists auto-suggest test stubs alongside their findings. And silent specialists that never find anything get auto-gated so reviews stay fast.