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)

test/fixtures/issues-closed.json

@@ -0,0 +1,27 @@
+[
+  {
+    "id": 300,
+    "number": 37,
+    "title": "Crash on empty config",
+    "body": "Fixed in 1.2.1",
+    "state": "closed",
+    "is_locked": false,
+    "comments": 1,
+    "created_at": "2026-04-10T11:00:00Z",
+    "updated_at": "2026-04-12T11:00:00Z",
+    "closed_at": "2026-04-12T11:00:00Z",
+    "html_url": "http://gitea.example/testowner/testrepo/issues/37",
+    "url": "http://gitea.example/api/v1/repos/testowner/testrepo/issues/37",
+    "user": {
+      "id": 9,
+      "login": "contributor",
+      "full_name": "A Contributor",
+      "email": "contributor@example.com"
+    },
+    "labels": [],
+    "milestone": null,
+    "assignee": null,
+    "assignees": null,
+    "pull_request": null
+  }
+]