Answer the review, and keep the opening node's bank

Nine findings from a review of the phase-14 stack. The one about a retry
withdrawing a memory is not a bug — a memory anchored to a node describes that
node, and it goes when the node goes. The root is the exception, and it is the
only one: migration 62 parked every memory written before memories had
coordinates on depth 0, so withdrawing the opening node would retire a whole
bank nobody attached there. A memory with no source range covers no story and
now stays; a summary that genuinely ends there is still withdrawn.

The rest are repairs.

* The adventure list quoted whichever attempt was written last rather than the
  one the story tells, so switching back left the index disagreeing with the
  page.
* A v1 import gave a typed memory no depth, rebuilding the NULL the migration
  exists to remove — invisible until the imported adventure forked.
* The action cap counted a v1 file's turns, and a turn expands into a row per
  saved attempt, so a file inside the cap could write a multiple of it.
* Forking a live node on a borrowed ancestor promoted a sibling on a branch the
  caller never named. It is a branch switch, and now says so.
* Switching attempts left the state, status and memory panels reading the
  previous take: the story does not change length, so nothing keyed on its
  length noticed. Same class as the branch-switch bug this phase already fixed.
* A retry after switching back numbered the new attempt into the middle of the
  group instead of the end.
* The cursor backfill numbered every action in the table once per adventure;
  correlated to the adventure being updated, it is an index lookup instead.
* Renaming a branch answered own_actions=0.

And one behaviour change recorded rather than repaired: script-visible history
and actionCount no longer count blank-text rows. That is the right shape and
there is no reading compatible with both, so plan/14 says so.

409 tests.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015H5qiyiR7gtFQaoDphHZ3g

backend/app/bundle.py

@@ -545,6 +545,16 @@ def _write_memories(
         # last action it summarises, which on one branch is that node's depth.
         if memory.depth is None and memory.source_end is not None:
             memory.depth = memory.source_end
+        # A v1 memory that summarises nothing — one the player typed — has no
+        # depth to derive, and leaving it NULL here would rebuild by import the
+        # exact state migration 62 exists to end: `Path._entry_clause` compares
+        # `depth <= max_depth`, which a NULL fails, so the memory would vanish
+        # from every branch the moment the imported adventure was forked. The
+        # root is the same answer the migration gives, and for the same reason
+        # — 0 is at or before every fork point, so it is visible from every
+        # path this adventure can grow.
+        if memory.depth is None:
+            memory.depth = lineage.ROOT_DEPTH
         db.add(memory)