fix(flr): partition-rooted FLR paths + agent/intent in checkpoint names (#2)

tests/test_checkpoints.py

@@ -1,18 +1,46 @@
 from datetime import UTC, datetime
 
-from zerto_rewind_mcp.checkpoints import checkpoint_id, checkpoint_tag, make_tag
+from zerto_rewind_mcp.checkpoints import (
+    TAG_MAX_LEN,
+    checkpoint_id,
+    checkpoint_tag,
+    make_tag,
+)
+
+WHEN = datetime(2026, 9, 21, 15, 4, 5, tzinfo=UTC)
 
 
-def test_tag_format():
-    when = datetime(2026, 9, 21, 15, 4, 5, tzinfo=UTC)
-    tag = make_tag("codex", "chg-99", when)
-    assert tag == "ai:codex:chg-99:20260921T150405Z"
+def test_tag_describes_agent_and_action():
+    tag = make_tag(
+        "claude",
+        "chg-99",
+        WHEN,
+        action="edit /home/justin/app-config.yaml",
+        vm_name="jp-ubuntu",
+    )
+    assert tag == (
+        "ai:claude | edit /home/justin/app-config.yaml | vm=jp-ubuntu "
+        "| change=chg-99 | 20260921T150405Z"
+    )
 
 
-def test_tag_strips_junk():
-    tag = make_tag("agent one", "path/with spaces", datetime(2026, 1, 1, tzinfo=UTC))
-    assert " " not in tag
-    assert tag.startswith("ai:agent-one:path-with-spaces:")
+def test_tag_without_action_or_vm():
+    assert make_tag("codex", "chg-99", WHEN) == "ai:codex | change=chg-99 | 20260921T150405Z"
+
+
+def test_tag_keeps_separators_unambiguous():
+    # ';' is what Zerto appends to its own tags; '|' is our field separator.
+    tag = make_tag("a;b", "c|d", WHEN, action="rm -rf /tmp;x", vm_name="v|m")
+    assert tag.count(" | ") == 4
+    assert ";" not in tag
+
+
+def test_tag_collapses_whitespace_and_caps_length():
+    tag = make_tag("agent one", "chg 1", WHEN, action="do\n  many   things")
+    assert "\n" not in tag
+    assert "do many things" in tag
+    long_tag = make_tag("a" * 200, "b" * 200, WHEN, action="c" * 400)
+    assert len(long_tag) <= TAG_MAX_LEN
 
 
 def test_checkpoint_row_keys():