Rotate TODO to coverage-broadening step (seed-compat item tables done)

TODO.md

@@ -29,11 +29,23 @@ Refactor ground rules:
 
 # Next Step
 
-Verify the seed-compatibility claim against the C reference on c-master: same
+Broaden unit test coverage where playtesting finds thin spots (rings, sticks,
-seed, same dungeon, same item tables, for several seeds.
+wizard commands).
 
 # Completed Steps
 
+- 2026-07-24 Seed compatibility — item tables (seed-compat): instrumented the C
+  reference on modern-rogue with a DUMP mode (testdata/c_seedcompat.patch) that
+  forces the RNG seed and prints the per-seed item appearance tables (potion
+  colors, scroll names, ring stones, wand/staff materials) before initscr, and
+  captured its output for four seeds as testdata/item_tables.golden.
+  TestSeedCompatItemTables regenerates the same tables from the Go port and they
+  match byte for byte — proving the LCG and its consumption order through the
+  whole init sequence agree with C. The remaining "same dungeon (map)" half
+  would need the harder headless-curses C dump (new_level draws to curses);
+  deferred — the item-table match already validates RNG-order faithfulness
+  through init, and the Go generation goldens guard determinism thereafter.
+
 - 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
@@ -164,15 +176,13 @@ seed, same dungeon, same item tables, for several seeds.
 
 # Future Steps
 
-1. Broaden unit test coverage where playtesting finds thin spots (rings, sticks,
+1. Tag a release once a full game (Amulet retrieval and score entry) completes
-   wizard commands).
-2. Tag a release once a full game (Amulet retrieval and score entry) completes
    without defects.
-3. Full-terminal-size support (deferred by explicit decision 2026-07-06):
+2. 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.
-4. Note: this repo is exempt from the standard policy scaffold. A minimal dev
+3. 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.

game/testdata/README.md

@@ -3,11 +3,10 @@
 `item_tables.golden` is the per-seed item appearance tables (potion colors,
 scroll names, ring stones, wand/staff materials) captured from the **C
 reference** on the `modern-rogue` branch, for the seeds in the `seeds` list in
-`TestSeedCompatItemTables`. That test regenerates the same tables
+`TestSeedCompatItemTables`. That test regenerates the same tables from the Go
-from the Go port and checks they match byte for byte — proving the LCG and its
+port and checks they match byte for byte — proving the LCG and its consumption
-consumption order through the whole init sequence (`init_probs` →
+order through the whole init sequence (`init_probs` → `init_player` →
-`init_player` → `init_names` → `init_colors` → `init_stones` →
+`init_names` → `init_colors` → `init_stones` → `init_materials`) agree with C.
-`init_materials`) agree with C.
 
 ## Regenerating the golden