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>

tasks/t17.md

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+---
+id: t17
+status: Review
+order: 0
+priority: P3
+created: 2026-10-24
+updated: 2026-10-24T16:29:07Z
+title: fog of war changes
+report: |
+  (agent) The bot now sees into the ground around it, through rock: about 20 grains in every
+  direction, fully clear, with a soft edge over the last few grains. It moves with the bot and
+  stays revealed afterwards, like the rest of the fog. Line of sight down tunnels and into caves
+  works as before (out to 48 grains).
+  To check: start or load a world, dig down, and look at the ore and caves showing in the rock
+  around the bot as you go.
+---
+
+## Context
+
+- Fog of war only reveals open areas the bot can see into, so you can't tell what's in the ground around you or where to dig. Also reveal the ground around the bot, through rock, out to about 20 grains with a soft edge. Ground revealed this way looks fully clear, the same as ground seen in the open.
+
+## Subtasks
+
+- [x] Reveal ground within about 20 grains of the bot, through rock, with a soft edge