feat: scaffold CLI and minimal issue list (task 0001)

Tracer bullet for gitea-axi: runnable npm package on axi-sdk-js with
gitea-js as the sole HTTP layer, ESM on Node 20+.

- issue list with --state/--limit, default fields, count line from
  X-Total-Count, type=issues guard, explicit empty state, and next-step
  suggestions
- repo context detection from the git origin remote (SSH/scp/HTTPS),
  tea credential discovery with the three-way login-matching split, and
  -R/--repo and --login overrides (flag > env > auto)
- token retrieval via tea login helper get: tea's login list JSON
  carries no token (ADR 0001 amended)
- full AxiError classification table with path-based 404 split, TOON
  errors on stdout, exit codes 0/1/2
- test mode (GITEA_AXI_API_URL/TOKEN/REPO) suppressing subprocesses,
  fixture server, and vitest suites driving the CLI seam (50 tests)

src/main.ts

@@ -0,0 +1,17 @@
+#!/usr/bin/env node
+import { runCli } from "./cli.js";
+
+// Exit quietly when the consumer closes the pipe early (e.g. `gitea-axi | head`).
+process.stdout.on("error", (error: NodeJS.ErrnoException) => {
+  if (error.code === "EPIPE") {
+    process.exit(0);
+  }
+  throw error;
+});
+
+await runCli({
+  argv: process.argv.slice(2),
+  env: process.env,
+  cwd: process.cwd(),
+  stdout: process.stdout,
+});