feat: add OpenCode/Codex outputs and update changelog (#104)

* Add OpenCode converter coverage and specs

* Add Codex target support and spec docs

* Generate Codex command skills and refresh spec docs

* Add global Codex install path

* fix: harden plugin path loading and codex descriptions

* feat: ensure codex agents block on convert/install

* docs: clarify target branch usage for review

* chore: prep npm package metadata and release notes

* docs: mention opencode and codex in changelog

* docs: update CLI usage and remove stale todos

* feat: install from GitHub with global outputs

tests/frontmatter.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, test } from "bun:test"
+import { formatFrontmatter, parseFrontmatter } from "../src/utils/frontmatter"
+
+describe("frontmatter", () => {
+  test("parseFrontmatter returns body when no frontmatter", () => {
+    const raw = "Hello\nWorld"
+    const result = parseFrontmatter(raw)
+    expect(result.data).toEqual({})
+    expect(result.body).toBe(raw)
+  })
+
+  test("formatFrontmatter round trips", () => {
+    const body = "Body text"
+    const formatted = formatFrontmatter({ name: "agent", description: "Test" }, body)
+    const parsed = parseFrontmatter(formatted)
+    expect(parsed.data.name).toBe("agent")
+    expect(parsed.data.description).toBe("Test")
+    expect(parsed.body.trim()).toBe(body)
+  })
+})