feat(sync): add one-shot full sync (TRUNCATE + bulk INSERT)

- New `sync.fullsync` CLI: `python -m sync.fullsync config.yaml [--db F] [--table T] [--clear-change-log]`
- AccessReader: list_user_tables / read_all_rows / read_all_log_ids
- SqlWriter: table_exists / truncate_target (TRUNCATE w/ DELETE fallback) / bulk_insert (SET IDENTITY_INSERT + chunked fast_executemany)
- Reuses FileMapping exclude/include rules (exclude beats include, same as capture)
- Preserves Access IDs via IDENTITY_INSERT; target schemas have no FKs so TRUNCATE is safe
- TableChangeLog NOT cleared by default (opt-in --clear-change-log)
- tests/test_fullsync.py covers resolve_tables exclude/include precedence

tests/test_fullsync.py

@@ -0,0 +1,56 @@
+"""Unit tests for the full-sync table-resolution rules.
+
+``resolve_tables`` is pure (no DB) once given a reader stub, so it is safe to
+exercise without Access/SQL connections. Run on a host with the project venv
+(e.g. 114), where ``pyodbc`` imports cleanly:
+
+    .venv\\Scripts\\python.exe -m pytest tests\\test_fullsync.py -q
+"""
+from sync.config import FileMapping
+from sync.fullsync import resolve_tables
+
+
+class FakeReader:
+    """Mirrors AccessReader.list_user_tables: system tables are already
+    filtered here, so resolve_tables only needs to apply the exclude/include
+    rules from the FileMapping."""
+
+    def __init__(self, tables):
+        self._tables = [
+            t for t in tables
+            if not (t.startswith("MSys") or t.startswith("~"))
+        ]
+
+    def list_user_tables(self):
+        return list(self._tables)
+
+
+def make_fm(**kw):
+    base = dict(file="x.accdb", root="2026", schema="s", year_suffix="")
+    base.update(kw)
+    return FileMapping(**base)
+
+
+def test_excludes_system_and_config_tables():
+    fm = make_fm(exclude_tables=["TableChangeLog", "Foo"])
+    r = FakeReader(["T1", "TableChangeLog", "MSysSysObjects", "~tmp", "Foo", "Bar"])
+    assert resolve_tables(r, fm) == ["T1", "Bar"]
+
+
+def test_include_tables_restricts_scope():
+    fm = make_fm(include_tables=["T1", "T2"])
+    r = FakeReader(["T1", "T2", "T3", "TableChangeLog"])
+    assert resolve_tables(r, fm) == ["T1", "T2"]
+
+
+def test_exclude_beats_include():
+    # Precedence matches capture.capture_file: exclude wins over include.
+    fm = make_fm(include_tables=["T1"], exclude_tables=["T1"])
+    r = FakeReader(["T1", "T2"])
+    assert resolve_tables(r, fm) == []
+
+
+def test_empty_when_all_excluded():
+    fm = make_fm(exclude_tables=["T1", "T2"])
+    r = FakeReader(["T1", "T2"])
+    assert resolve_tables(r, fm) == []