New-world lakes start level; no trees in water (t96)

docs/DESIGN.md

@@ -590,6 +590,13 @@ above, including:
   ordinary repose rules take over. Keep stamped moves, barriers, burning-bed protection and
   worker independence. The existing worldgen POWDER_FAN switch disables new face releases.
 
+- **New-world lakes wake immediately; keep the seed layout (t96, 2026-10-29).** Keep the
+  recorded worldgen settling speeds and material/temperature output. Wake water after the
+  final startup reset so unfinished lakes level without drilling. Retain tree candidates and
+  their random draws, then omit whole trees whose bases are wet or on an open bank connected
+  to water at base height after settling. This keeps trees out of the lake as it spreads.
+  Existing load wake scheduling and later snowmelt/flooding rules stay as they are.
+
 ## Ideas not built yet
 
 - **Concrete**, as a stronger wall material from rubble.

docs/PROJECT_MAP.md

@@ -383,7 +383,7 @@ World generation helpers: noise and removal of tiny hard rock specks.
 - functions: makeNoise, fbm, clearHardSpecks
 - variables: SPECK_MIN
 
-### src/sim/worldgen.js (286 lines)
+### src/sim/worldgen.js (303 lines)
 World generation: staged terrain, ore, caves and placement, with synchronous and async entry points.
 - functions: generateWorld, generateWorldAsync
 
@@ -656,6 +656,7 @@ The frame loop and boot.
 - `test/t_gpu_golden.py`: Frozen world references; seven smooth crops corrected for continuous noise in t91.
 - `test/t_gpu_light.py`: The former CPU light behavioural checks, now read from the actual GPU light grid.
 - `test/t_joins.js`: The oracle states the geometric rule independently of the precomputed neighbour tables.
+- `test/t_lakes.js`: Generated lakes wake without a tool, settle on their own, and have dry tree bases.
 - `test/t_load.js`: Reload wakes nearby areas first, without losing distant water, fire or saved state.
 - `test/t_molds.js`: Molds and furnaces stay usable: ingots drop below and keep their stubs, plugs over molds are cleared, spoiled castings can be knocked out, grains never drop through a grate by teleporting, and slag lets the fire breathe.
 - `test/t_nozzle.js`: Blowing aims within the nozzle's reach, with room for the brush and settling.

docs/TESTING.md

@@ -69,6 +69,11 @@ seeded sand pile bounds in `t_corner_seal.js`; the heat oracle now supports pass
 The conveyor fixture uses a wider feed pile, the screen fixture warms longer, and `t_load.js`
 checks waking within eight ticks separately from the probabilistic consumption of fuel.
 
+`test/t_lakes.js` pins SHA-256 over raw `mat` followed by Float32 `temp` bytes for seeds
+7, 42 and 424242 at 2048x1024. These hashes predate t96 and must not be re-baselined for a
+wake/background-tree change. It also checks generated tree bases, startup wakes, and the
+seed-7 lake leveling within two grains after 6,000 undisturbed ticks, fresh and reloaded.
+
 ## Browser tests
 
 - They need the `.venv` from README.md → Develop; plain `python3` switches to it on its own.

docs/agent-log.md

@@ -4,6 +4,18 @@ What agents have done, newest first. Add an entry for every piece of work: the d
 note or request it was for, what changed, the files touched, the tests run, and anything left
 open or not verified. Keep each entry short; the git history has the details.
 
+## 2026-10-29: t96 wake new-world lakes and keep trees off their banks (Codex)
+
+- Wake water after startup reset; omit whole tree candidates on wet/water-connected low banks.
+  Original mat+temp hashes match for seeds 7/42/424242; pinned settling, physics and save format unchanged.
+- Files: src/sim/worldgen.js, test/t_lakes.js, docs/{DESIGN,TESTING,PROJECT_MAP}.md, tasks/t96* and this log.
+- Tests failed first; all 38 headless suites pass (23 lake checks; /tmp/t96-headless.log).
+  Only browser test: /tmp/playwright-test-t96.py (fresh/reloaded seed 7, pixel, two helpers, no page errors;
+  /tmp/t96-browser-final.log). Inspected shots/t96-{fresh,fresh-settled,reloaded-settled}.png.
+  Sandbox graphics startup stalled; outside-sandbox run passed. No full browser suite.
+- Lake moves on tick 1; levels within two grains by 6,000 ticks (100 seconds). Later snowmelt
+  can flood other trees; that behavior is unchanged. Owner playtest pending. No commit.
+
 ## 2026-10-29: t95 separate nozzle and rain flight allowances (Codex)
 
 - Nozzle counts bag flyers only, up to 4,000, with “Too much in the air.” feedback;