feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/opencode/src/cli/cmd/github.ts

@@ -0,0 +1,42 @@
+import { Effect } from "effect"
+import { cmd } from "./cmd"
+import { effectCmd } from "../effect-cmd"
+
+export { extractResponseText, formatPromptTooLargeError, parseGitHubRemote } from "./github.shared"
+
+export const GithubInstallCommand = effectCmd({
+  command: "install",
+  describe: "install the GitHub agent",
+  handler: () =>
+    Effect.gen(function* () {
+      const { githubInstall } = yield* Effect.promise(() => import("./github.handler"))
+      return yield* githubInstall()
+    }),
+})
+
+export const GithubRunCommand = effectCmd({
+  command: "run",
+  describe: "run the GitHub agent",
+  builder: (yargs) =>
+    yargs
+      .option("event", {
+        type: "string",
+        describe: "GitHub mock event to run the agent for",
+      })
+      .option("token", {
+        type: "string",
+        describe: "GitHub personal access token (github_pat_********)",
+      }),
+  handler: (args) =>
+    Effect.gen(function* () {
+      const { githubRun } = yield* Effect.promise(() => import("./github.handler"))
+      return yield* githubRun(args)
+    }),
+})
+
+export const GithubCommand = cmd({
+  command: "github",
+  describe: "manage GitHub agent",
+  builder: (yargs) => yargs.command(GithubInstallCommand).command(GithubRunCommand).demandCommand(),
+  async handler() {},
+})