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/git.test.ts

@@ -0,0 +1,53 @@
+import { describe, expect, it } from "vitest";
+import { parseRemoteUrl } from "../src/git.js";
+
+describe("parseRemoteUrl", () => {
+  it("parses HTTPS remotes with and without .git", () => {
+    expect(parseRemoteUrl("https://git.example.com/owner/repo.git")).toEqual({
+      host: "git.example.com",
+      owner: "owner",
+      name: "repo",
+    });
+    expect(parseRemoteUrl("https://git.example.com/owner/repo")).toEqual({
+      host: "git.example.com",
+      owner: "owner",
+      name: "repo",
+    });
+  });
+
+  it("parses HTTP remotes with a port", () => {
+    expect(parseRemoteUrl("http://git.example.com:3000/owner/repo.git")).toEqual({
+      host: "git.example.com",
+      owner: "owner",
+      name: "repo",
+    });
+  });
+
+  it("parses scp-form SSH remotes", () => {
+    expect(parseRemoteUrl("git@git.example.com:owner/repo.git")).toEqual({
+      host: "git.example.com",
+      owner: "owner",
+      name: "repo",
+    });
+    expect(parseRemoteUrl("git.example.com:owner/repo")).toEqual({
+      host: "git.example.com",
+      owner: "owner",
+      name: "repo",
+    });
+  });
+
+  it("parses ssh:// remotes with a port", () => {
+    expect(parseRemoteUrl("ssh://git@git.example.com:2222/owner/repo.git")).toEqual({
+      host: "git.example.com",
+      owner: "owner",
+      name: "repo",
+    });
+  });
+
+  it("rejects URLs without an owner/name path", () => {
+    expect(parseRemoteUrl("https://git.example.com/owner")).toBeNull();
+    expect(parseRemoteUrl("https://git.example.com/a/b/c")).toBeNull();
+    expect(parseRemoteUrl("not a url")).toBeNull();
+    expect(parseRemoteUrl("/local/path/repo.git")).toBeNull();
+  });
+});