Rotate TODO to seed-verification step (playtest hardening done)

TODO.md

@@ -29,16 +29,23 @@ Refactor ground rules:
 
 # Next Step
 
-Playtest hardening pass: play several full games with the tcell binary and
-extend run_test.go to drive a deeper multi-level playthrough (descend past level
-5, use potions, scrolls, zapping, save/restore). Note: game-over now exits the
-process (step 8), so scripted drives must stay bounded and avoid
-death/quit/save-command; exercise the exit paths (death display, 'S' save)
-another way if needed. Fix any panics, message mismatches, or divergences from
-the C behavior that this uncovers, with regression tests.
+Verify the seed-compatibility claim against the C reference on c-master: same
+seed, same dungeon, same item tables, for several seeds.
 
 # Completed Steps
 
+- 2026-07-23 Playtest hardening (playtest-hardening): added two death-safe
+  crash-sweep drives through the real turn loop, within the step-8 os.Exit
+  constraint (a fortify() helper pins HP/food/exp and clears the freeze/stuck
+  counters each turn so no death exits the test binary; fixed seeds keep them
+  deterministic). TestDeepPlaythrough uses quaff/read/zap through command
+  dispatch, then descends to depth 8 with a save/restore at depth 4;
+  TestTurnLoopCrashSweep mashes movement/search/rest for 200 turns on four
+  seeds. Neither surfaced a panic. The interactive "play several games at a real
+  tcell terminal" portion needs a human at an 80x24 terminal and is left to the
+  maintainer; the binary's non-interactive paths (`-s` scores) were
+  smoke-tested.
+
 - 2026-07-23 Docs refresh (docs-refresh): rewrote ARCHITECTURE.md Part 2 (the
   pre-implementation design sketch) to match the final code — current type/field
   names (ObjectKind, DiceSpec, split o_arm, step-1 flag names, TrapCount, Level
@@ -157,17 +164,15 @@ the C behavior that this uncovers, with regression tests.
 
 # Future Steps
 
-1. Verify the seed-compatibility claim against the C reference on c-master: same
-   seed, same dungeon, same item tables, for several seeds.
-2. Broaden unit test coverage where playtesting finds thin spots (rings, sticks,
+1. Broaden unit test coverage where playtesting finds thin spots (rings, sticks,
    wizard commands).
-3. Tag a release once a full game (Amulet retrieval and score entry) completes
+2. Tag a release once a full game (Amulet retrieval and score entry) completes
    without defects.
-4. Full-terminal-size support (deferred by explicit decision 2026-07-06):
+3. Full-terminal-size support (deferred by explicit decision 2026-07-06):
    per-game dungeon dimensions instead of the 80x24 constants; open design
    questions are resize policy, gameplay tuning at larger sizes, and a --classic
    80x24 mode.
-5. Note: this repo is exempt from the standard policy scaffold. A minimal dev
+4. Note: this repo is exempt from the standard policy scaffold. A minimal dev
    Makefile (fmt/fmt-check/lint/test/check targets) exists per sneak's
    2026-07-07 request, but do not add a Dockerfile, CI config, or
    REPO_POLICIES.md.