Add Veto harness support (#675)

Adds Veto detection, provider transforms, installation paths, documentation, and regression coverage.\n\nAI-assisted maintainer repair, review, and validation by Codex under maintainer direction.

scripts/build.js

@@ -10,6 +10,7 @@
  * - Codex: dist/codex/ only (OpenAI-metadata bundle; not synced to repo root)
  * - Agents: .agents/skills/ (Codex repo/user installs)
  * - GitHub: .github/skills/ (GitHub Copilot)
+ * - Veto: .veto/skills/ (Veto model-routing harness)
  *
  * Also assembles a universal ZIP containing all providers,
  * and builds Tailwind CSS for production deployment.
@@ -550,6 +551,7 @@ This folder contains skills for all supported tools:
   .trae/      -> Trae International
   .rovodev/   -> Rovo Dev
   .vibe/      -> Mistral Vibe
+  .veto/      -> Veto model-routing harness
   .qoder/     -> Qoder
 
 To install, copy the relevant folder(s) into your project root.

scripts/lib/transformers/index.js

@@ -19,5 +19,6 @@ export const transformVibe = createTransformer(PROVIDERS.vibe);
 export const transformGrok = createTransformer(PROVIDERS.grok);
 export const transformAntigravity = createTransformer(PROVIDERS.antigravity);
 export const transformHermes = createTransformer(PROVIDERS.hermes);
+export const transformVeto = createTransformer(PROVIDERS.veto);
 
 export { createTransformer, PROVIDERS };

scripts/lib/transformers/providers.js

@@ -138,6 +138,13 @@ export const PROVIDERS = {
     displayName: 'Mistral Vibe',
     frontmatterFields: ['user-invocable', 'license', 'compatibility', 'metadata', 'allowed-tools'],
   },
+  veto: {
+    provider: 'veto',
+    providerTags: ['veto'],
+    configDir: '.veto',
+    displayName: 'Veto',
+    frontmatterFields: ['license', 'compatibility', 'metadata'],
+  },
   grok: {
     provider: 'grok',
     providerTags: ['grok'],

scripts/lib/utils.js

@@ -526,6 +526,12 @@ export const PROVIDER_PLACEHOLDERS = {
     ask_instruction: 'Ask the user directly to clarify what you cannot infer.',
     command_prefix: '/'
   },
+  veto: {
+    model: 'the selected model',
+    config_file: '~/.veto/config.json',
+    ask_instruction: 'Ask the user directly to clarify what you cannot infer.',
+    command_prefix: '/',
+  },
   'vibe': {
     model: 'Mistral',
     config_file: 'AGENTS.md',
@@ -574,6 +580,7 @@ export const PROVIDER_BLOCK_TAGS = new Set([
   'trae',
   'trae-cn',
   'vibe',
+  'veto',
 ]);
 
 /**