restructure docs: split triggers into usage pages, add model resolution docs

- split triggers.mdx into direct-prompting, pr-reviews, issue-enrichment, coding-tasks
- rename manual-setup.mdx to headless-action.mdx (CI integration)
- reorganize sidebar into Getting started / Usage / Reference groups
- add redirects for /triggers and /manual-setup
- add PULLFROG_MODEL env var support across action, workflows, and docs
- rewrite models.mdx with aliases, free models, resolution chain, routers
- update all cross-references in app, components, and docs

Made-with: Cursor

entry

@@ -132047,6 +132047,7 @@ var providers = {
         displayName: "GPT Codex Mini",
         resolve: "openrouter/openai/gpt-5.1-codex-mini"
       },
+      "o4-mini": { displayName: "O4 Mini", resolve: "openrouter/openai/o4-mini" },
       "gemini-pro": {
         displayName: "Gemini Pro",
         resolve: "openrouter/google/gemini-3.1-pro-preview"
@@ -148779,9 +148780,10 @@ function getOpenCodeModels(cliPath) {
 }
 var AUTO_SELECT_WARNING = "select a model explicitly in the Pullfrog console (https://pullfrog.com/console) to avoid this.";
 function resolveOpenCodeModel(ctx) {
-  const envModel = process.env.OPENCODE_MODEL?.trim();
+  const envModel = process.env.PULLFROG_MODEL?.trim() || process.env.OPENCODE_MODEL?.trim();
   if (envModel) {
-    log.info(`\xBB model: ${envModel} (override via OPENCODE_MODEL)`);
+    const source = process.env.PULLFROG_MODEL?.trim() ? "PULLFROG_MODEL" : "OPENCODE_MODEL";
+    log.info(`\xBB model: ${envModel} (override via ${source})`);
     return envModel;
   }
   if (ctx.modelSlug) {