Fog of war reveals the ground around the bot through rock (t17)

Also: board rule to write tasks from chat in our own words, task
descriptions rewritten that way, and a note on lost web-board descriptions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/t_fog.js

@@ -9,6 +9,9 @@ rect(run, 40, 100, 140, 110, run('EMPTY'));
 rect(run, 40, 125, 140, 135, run('EMPTY'));
 run('bot.x = 60; bot.y = 102; fogLook(62.5, 104.5)');
 check('open pocket is visible', run('fogSeen(82, 104) >= 200'));
+check('sense test points are rock', run('mat[117 * W + 62] === STONE && mat[122 * W + 62] === STONE'));
+check('nearby rock is clearly seen through the floor', run('fogSeen(62, 117) >= 200'));
+check('rock near the sense edge is seen', run('fogSeen(62, 122) > 0'));
 check('rock hides separate pocket', run('fogSeen(62, 130) === 0'));
 check('one look has limited range', run('fogSeen(124, 104) === 0'));
 check('fog only increases', run('(()=>{const f = fog.slice(); fogLook(90,104); return f.every((v,i)=>fog[i]>=v)})()'));