Scaffold bggpipe: typer CLI, config loading, title normalization

uv project with typer/httpx/rapidfuzz, ruff and pytest wired into
pyproject. Six stub subcommands matching the pipeline stages, config.toml
plus BGG_USERNAME env override, accent/ampersand/article-safe title
normalization with tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/test_config.py

@@ -0,0 +1,31 @@
+from pathlib import Path
+
+from bggpipe.config import Config, load_config
+
+
+def test_defaults_when_no_file(tmp_path, monkeypatch):
+    monkeypatch.delenv("BGG_USERNAME", raising=False)
+    cfg = load_config(tmp_path / "missing.toml")
+    assert cfg == Config()
+    assert cfg.cache_dir == Path("data/bgg_cache")
+
+
+def test_reads_toml(tmp_path, monkeypatch):
+    monkeypatch.delenv("BGG_USERNAME", raising=False)
+    p = tmp_path / "config.toml"
+    p.write_text(
+        'bgg_username = "someone"\ndata_dir = "elsewhere"\nrate_limit_seconds = 3\n'
+    )
+    cfg = load_config(p)
+    assert cfg.bgg_username == "someone"
+    assert cfg.data_dir == Path("elsewhere")
+    assert cfg.rate_limit_seconds == 3.0
+    assert cfg.matches_path == Path("elsewhere/matches.csv")
+
+
+def test_env_overrides_toml(tmp_path, monkeypatch):
+    p = tmp_path / "config.toml"
+    p.write_text('bgg_username = "from_toml"\n')
+    monkeypatch.setenv("BGG_USERNAME", "from_env")
+    cfg = load_config(p)
+    assert cfg.bgg_username == "from_env"