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-open.json

@@ -0,0 +1,78 @@
+[
+  {
+    "id": 301,
+    "number": 42,
+    "title": "Fix login redirect loop, please",
+    "body": "Steps to reproduce: log in twice.",
+    "state": "open",
+    "is_locked": false,
+    "comments": 2,
+    "created_at": "2026-07-01T10:00:00Z",
+    "updated_at": "2026-07-08T09:30:00Z",
+    "html_url": "http://gitea.example/testowner/testrepo/issues/42",
+    "url": "http://gitea.example/api/v1/repos/testowner/testrepo/issues/42",
+    "user": {
+      "id": 7,
+      "login": "alexion",
+      "full_name": "Alexion",
+      "email": "alexion@example.com"
+    },
+    "labels": [
+      { "id": 1, "name": "bug", "color": "ee0701" }
+    ],
+    "milestone": null,
+    "assignee": null,
+    "assignees": null,
+    "pull_request": null
+  },
+  {
+    "id": 302,
+    "number": 41,
+    "title": "Add dark mode",
+    "body": "",
+    "state": "open",
+    "is_locked": false,
+    "comments": 0,
+    "created_at": "2026-06-20T15:45:00Z",
+    "updated_at": "2026-06-20T15:45:00Z",
+    "html_url": "http://gitea.example/testowner/testrepo/issues/41",
+    "url": "http://gitea.example/api/v1/repos/testowner/testrepo/issues/41",
+    "user": {
+      "id": 9,
+      "login": "contributor",
+      "full_name": "A Contributor",
+      "email": "contributor@example.com"
+    },
+    "labels": [],
+    "milestone": null,
+    "assignee": null,
+    "assignees": null,
+    "pull_request": null
+  },
+  {
+    "id": 303,
+    "number": 38,
+    "title": "Docs: document the release process",
+    "body": "The release process lives only in someone's head.",
+    "state": "open",
+    "is_locked": false,
+    "comments": 5,
+    "created_at": "2026-05-02T08:00:00Z",
+    "updated_at": "2026-07-01T12:00:00Z",
+    "html_url": "http://gitea.example/testowner/testrepo/issues/38",
+    "url": "http://gitea.example/api/v1/repos/testowner/testrepo/issues/38",
+    "user": {
+      "id": 7,
+      "login": "alexion",
+      "full_name": "Alexion",
+      "email": "alexion@example.com"
+    },
+    "labels": [
+      { "id": 2, "name": "documentation", "color": "0075ca" }
+    ],
+    "milestone": null,
+    "assignee": null,
+    "assignees": null,
+    "pull_request": null
+  }
+]