Add OpenAI plugin submission bundle

Build a Codex-native OpenAI plugin with bundled hooks, public listing metadata, submission guidance, privacy coverage, and regression tests.

AI assistance: OpenAI Codex prepared and validated these changes under maintainer direction.

scripts/lib/validate-plugin-versions.js

@@ -15,6 +15,8 @@
  *     subtree fails loudly instead of merging a drift window onto main.
  *   - `plugin/skills/impeccable/SKILL.md` frontmatter version — generated;
  *     same rationale.
+ *   - `dist/openai/impeccable/.codex-plugin/plugin.json` version — generated
+ *     for public OpenAI submission and checked when that build output exists.
  *
  * The collector is pure (filesystem-in, data-out) so it can be unit-tested
  * against fixtures; build.js owns the logging and the non-zero exit.
@@ -96,6 +98,10 @@ export function collectPluginVersions(rootDir) {
       relPath: 'plugin/.claude-plugin/plugin.json',
       read: (raw) => JSON.parse(raw).version,
     },
+    {
+      relPath: 'dist/openai/impeccable/.codex-plugin/plugin.json',
+      read: (raw) => JSON.parse(raw).version,
+    },
     {
       relPath: 'plugin/skills/impeccable/SKILL.md',
       read: (raw) => readSkillFrontmatterVersion(raw),