New worlds get generated camp names like new claims (t3)

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

docs/PROJECT_MAP.md

@@ -442,7 +442,7 @@ Previews drawn under the cursor: build ghosts, drill aim and pulses, selections,
 Events from the simulation (emit) turned into sounds, toasts and cards.
 - functions: drainEvents
 
-### src/ui/loop.js (127 lines)
+### src/ui/loop.js (133 lines)
 The frame loop and boot.
 - functions: scanVisible, frame, boot
 - variables: lastT, acc, lastRender, frameMs, simMs, fpsSm, ambientT

docs/agent-log.md

@@ -4,6 +4,12 @@ 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: New worlds get camp names too (Claude Code, Codex)
+
+- The new-world dialog prefills `claimName(seed, existing names)` instead of "World N", and
+  follows seed edits until the player types their own name; a blank name falls back to it too
+  (`src/ui/loop.js`, `session.js`). play.py checks updated. All tests pass.
+
 ## 2026-10-24: t30: progress while generating, loading and saving (Claude Code, Codex)
 
 - `worldgen.js`: `worldSteps` generator yields `[fraction, label]`; `generateWorld` (sync, tests)