Add OpenAI plugin submission bundle (#363)

* 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.

* Fix provider script command rendering

Replace heuristic rewrites across executable scripts with one explicit provider marker, render pinned shortcuts per target harness, and remove the personal email from the public publisher manifest.

Addresses automated review feedback on PR #363.

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

skill/scripts/context.mjs

@@ -23,6 +23,7 @@ import os from 'node:os';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { parseTargetOptions } from './lib/target-args.mjs';
+import { IMPECCABLE_COMMAND } from './lib/provider.mjs';
 
 const PRODUCT_NAMES = ['PRODUCT.md', 'Product.md', 'product.md'];
 const DESIGN_NAMES = ['DESIGN.md', 'Design.md', 'design.md'];
@@ -902,7 +903,7 @@ async function cli() {
       'or wording that clearly maps to a from-scratch build/shape flow, load ' +
       'reference/init.md and write PRODUCT.md first; for any other (scoped) ' +
       'command against existing code, proceed using the code as context and ' +
-      'offer `/impeccable init` as a suggestion (do not block).',
+      `offer \`${IMPECCABLE_COMMAND} init\` as a suggestion (do not block).`,
     ];
     parts.push(buildResolvedContextDirective(ctx, cliOptions, { targetExists }));
     if (shouldWarnMissingTarget(ctx, targetProvided, targetExists)) {