phase: 102_extensionless_filenames

All verification complete — every gate green, no defects found in previously completed work.

**Phase 102 final verification pass — report**

Verified (all three task files present in `complete/`; working-tree implementation matches D1–D5 design):
- `match_extension` choke point in `app/rag/importer.py` (walk + `formats` counter), `doc_format` name-token badge in `app/api/docs.py`, config/`.env.example` docs, fixture `tests/fixtures/extensionless_kb/`, integration + E2E suites — all present and correct
- Completion criteria: end-to-end sync (✓ integration + E2E), case matrix incl. `mydockerfile`/`Dockerfile.dev`/`.dockerfile` exclusions (✓ unit), `formats=dockerfile:1` not `unknown` (✓ log-line assertion), badge `dockerfile`/`containerfile` + `text` fallback + suffixed unchanged (✓ unit/integration/E2E), prune-on-token-removal (✓ `pruned==2`), suffixed-path rule byte-identical (✓ single-line swap, existing cases untouched)

Test / lint results (exact commands):
- `uv run pytest --cov=app --cov-report=term-missing` → 2084 passed, **99%** coverage (>90% gate)
- `uv run pytest tests/e2e/test_extensionless_import.py -v --no-cov` → 2 passed, isolated, DB up
- Regressions isolated: `test_import_documents` 3✓, `test_import_extensions_env` 2✓, `test_quadlet_jinja_import` 4✓, `test_document_viewer` 7✓, `test_kb_tree` 8✓
- `uv run ruff check .` → clean; `uv run pyright` → 0 errors, 0 warnings

Notable: commit intentionally not made (harness commits the phase); 102's task files already sit in `complete/`, overview stays in `todo/` for the harness.
Next pending phases: 98, 99, 103, 104, 105 (numeric next after 102: `103_suggestions_session_openers`).

tests/unit/test_importer.py

@@ -27,6 +27,7 @@ from app.rag.importer import (
     _store_summary,
     import_sources,
     iter_importable_files,
+    match_extension,
 )
 from app.rag.llm import EmbeddingError
 from tests.fakes import FakeEmbedder
@@ -59,6 +60,15 @@ class _CapEmbedder(FakeEmbedder):
         return await super().embed(texts)
 
 
+def _embedder_with_extensions(extensions: str) -> FakeEmbedder:
+    """A :class:`FakeEmbedder` whose settings carry a custom
+    ``BOR_IMPORT_EXTENSIONS`` CSV (phase 102 — the import scope the walk
+    and the ``formats`` counter read from ``llm.settings``)."""
+    llm = FakeEmbedder()
+    llm.settings = Settings(_env_file=None, import_extensions=extensions)  # pyright: ignore[reportCallIssue]
+    return llm
+
+
 def _cleanup_source(db, source: str) -> None:
     for doc in db.scalars(select(Document).where(Document.source == source)).all():
         db.delete(doc)
@@ -199,6 +209,48 @@ def test_iter_importable_files_respects_custom_extension_filter(tmp_path: Path)
     assert found == {"a.md"}
 
 
+def test_match_extension_matrix() -> None:
+    """Phase 102, D1 — the matching matrix: the A9 dotted-suffix rule first,
+    then the extensionless exact-name rule (case-insensitive), exact name
+    only — no partial matching, suffixed files governed by their suffix."""
+    exts = frozenset({".md", ".dockerfile"})
+    # Rule 1 — the dotted suffix (case-insensitive, as today):
+    assert match_extension(Path("kubernetes.md"), frozenset({".md"})) == "md"
+    assert match_extension(Path("Kubernetes.MD"), frozenset({".md"})) == "md"
+    # Rule 2 — extensionless files by exact lowercased FULL filename:
+    assert match_extension(Path("Dockerfile"), exts) == "dockerfile"
+    assert match_extension(Path("DOCKERFILE"), exts) == "dockerfile"
+    # …only when the token is actually in the set:
+    assert match_extension(Path("Dockerfile"), frozenset({".md"})) is None
+    # Exact name only — compound lookalikes never match the token:
+    assert match_extension(Path("mydockerfile"), exts) is None
+    # A suffixed file is governed by its suffix, never its name:
+    assert match_extension(Path("Dockerfile.dev"), exts) is None
+    assert match_extension(Path("Dockerfile.dev"), frozenset({".md", ".dev"})) == "dev"
+    # An out-of-scope suffix is out of scope, name be damned:
+    assert match_extension(Path("readme.rst"), frozenset({".md"})) is None
+
+
+def test_iter_importable_files_walks_extensionless_name_tokens(tmp_path: Path) -> None:
+    """Phase 102, D1 — an extensionless file walks iff its lowercased full
+    name is a token (``md,dockerfile,containerfile`` here): lookalikes and
+    the dot-prefixed hidden file stay skipped by the pre-existing rules."""
+    root = tmp_path / "build"
+    root.mkdir()
+    for name in (
+        "Dockerfile",
+        "Containerfile",
+        "mydockerfile",  # compound name — never matches the `dockerfile` token
+        "Dockerfile.dev",  # governed by its .dev suffix (not a token here)
+        ".dockerfile",  # dot-prefixed FILE — the hidden-component rule
+        "notes.md",
+    ):
+        (root / name).write_text(f"# {name}\n\nbody {name}\n")
+    exts = frozenset({".md", ".dockerfile", ".containerfile"})
+    found = [p.name for p in iter_importable_files(root, exts)]
+    assert found == ["Containerfile", "Dockerfile", "notes.md"]
+
+
 def test_excluded_dirs_match_plan_anchor_a9() -> None:
     assert {
         ".venv", "node_modules", ".git", "__pycache__", ".pytest_cache", "dist", "build"
@@ -711,6 +763,36 @@ def test_prune_removes_files_now_excluded_by_format_filter(db, tmp_path: Path) -
         _cleanup_source(db, root.name)
 
 
+# ---------- phase 102: extensionless name-token import ----------
+
+
+def test_formats_counter_counts_extensionless_name_token(
+    db, tmp_path: Path, caplog: pytest.LogCaptureFixture
+) -> None:
+    """Phase 102, D2 — an imported ``Dockerfile`` counts under
+    ``dockerfile`` in ``summary.formats`` and the PLAN §9 line, never
+    ``unknown``."""
+    root = tmp_path / "extless"
+    root.mkdir()
+    (root / "Dockerfile").write_text("FROM alpine\n\nCMD [\"/bin/sh\"]\n")
+    (root / "notes.md").write_text("# Notes\n\nbody\n")
+    llm = _embedder_with_extensions("md,dockerfile")
+    try:
+        with caplog.at_level(logging.INFO, logger="app.importer"):
+            summary = asyncio.run(import_sources([root], llm, session=db))
+        assert summary.files == 2 and summary.added == 2
+        assert summary.formats == {"dockerfile": 1, "md": 1}
+        line = next(
+            r.getMessage()
+            for r in caplog.records
+            if "import: summary files=" in r.getMessage()
+        )
+        assert line.endswith("formats=dockerfile:1,md:1")
+        assert "unknown" not in line
+    finally:
+        _cleanup_source(db, root.name)
+
+
 # ---------- phase 64 (task 01): optional per-file progress hook ----------