feat: experiment log append/read utilities and rich viewer

tests/test_log.py

@@ -0,0 +1,44 @@
+import sys, os, json, tempfile, pytest
+sys.path.insert(0, 'bin')
+from log_append import append_entry, read_entries, LOG_PATH
+
+def test_append_creates_file(tmp_path):
+    log = str(tmp_path / "log.jsonl")
+    append_entry({"project": "test"}, path=log)
+    assert os.path.exists(log)
+
+def test_append_writes_valid_json(tmp_path):
+    log = str(tmp_path / "log.jsonl")
+    append_entry({"project": "x", "kept": True}, path=log)
+    with open(log) as f:
+        data = json.loads(f.read().strip())
+    assert data["project"] == "x"
+    assert data["kept"] is True
+
+def test_append_adds_timestamp(tmp_path):
+    log = str(tmp_path / "log.jsonl")
+    append_entry({"project": "x"}, path=log)
+    with open(log) as f:
+        data = json.loads(f.read().strip())
+    assert "ts" in data
+
+def test_append_multiple_entries(tmp_path):
+    log = str(tmp_path / "log.jsonl")
+    for i in range(3):
+        append_entry({"n": i}, path=log)
+    entries = read_entries(path=log)
+    assert len(entries) == 3
+    assert entries[1]["n"] == 1
+
+def test_read_entries_empty_if_no_file(tmp_path):
+    log = str(tmp_path / "nonexistent.jsonl")
+    assert read_entries(path=log) == []
+
+def test_read_entries_skips_malformed_lines(tmp_path):
+    log = str(tmp_path / "log.jsonl")
+    with open(log, 'w') as f:
+        f.write('{"project": "ok"}\n')
+        f.write('not-valid-json\n')
+        f.write('{"project": "also-ok"}\n')
+    entries = read_entries(path=log)
+    assert len(entries) == 2