Material menu for walls and molds, opened with F (t5)

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

docs/agent-log.md

@@ -4,6 +4,19 @@ 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.
 
+## 2026-10-24: t5 Material selection menu (Claude Code, Codex)
+
+- Decided with the owner: F opens it for walls and molds, R keeps cycling.
+- `src/ui/selection.js`: `openWallPicker` (a dialog of every wall material: what you have, the
+  cost for this piece, the heat it stands; owned first, unaffordable dimmed; glass says whether
+  it is from shards or bars); `pieceCostNow(P, m)` takes a material.
+- `src/ui/actions.js`: F with a wall or mold piece opens it. `src/ui/build-menu.js`: the material
+  chip reads "· R · F" and opens it on click; placement help mentions F. `src/ui/notebook.js`:
+  Controls and Blueprints text. `src/styles/style.css`: `.wpick`.
+- `test/play.py`: F and the chip open it, Brick picks RBRICK, R still cycles, molds have their own
+  menu and cost, it fits at 1280×800 and 900×700 (screenshots checked).
+- Tests: `run_all.py --browser` pass, apart from the `t_smooth` half-resolution flake.
+
 ## 2026-10-24: t10 World name box for a new world (Claude Code, Codex)
 
 - `src/shell.html`, `src/styles/style.css`: a Name box across the top of the New world panel.