Loading a world clears cards left from the last one (t11)

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

docs/PROJECT_MAP.md

@@ -374,7 +374,7 @@ Saves in IndexedDB, world files (export / import) and the blueprint library.
 - functions: newWorldId, worldWrite, listWorlds, putWorldEntry, worldNewest, deleteWorld, renameWorld, migrateWorlds, saveWorld, newestSave, b64FromBytes, bytesFromB64, gz, exportWorld, importWorldFile, libLoad, libSave, bpEncode, bpValid, bpDecode
 - variables: DB, worldIdTime, worldIdCounter, worldWrites
 
-### src/ui/session.js (122 lines)
+### src/ui/session.js (125 lines)
 Starting, loading and quitting a game; modal dialogs; the pause menu.
 - functions: showLoading, enterGame, startNewWorld, startFromSave, quitToTitle, refreshContinue, anyModal, openModal, closeModal, closeAllModals, topModal, dialog, openPause, renderWorlds
 

docs/agent-log.md

@@ -4,6 +4,16 @@ 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: t11 Welcome and first milestone shown again on an older world (Claude Code, Codex)
+
+- Cause: nothing cleared the discovery cards (`#cards`) when a world was entered, so a new
+  world's Welcome and milestone cards stayed up after loading an older world.
+- `src/ui/session.js`: `enterGame` clears the cards, floaters, particles and the status line;
+  a new world still shows its Welcome card afterwards.
+- `test/play.py`: a new world shows Welcome; loading a world from the list shows no cards.
+- Tests: `run_all.py --browser` passes (153 `play.py` checks). `t_smooth`'s half-resolution
+  check flaked (passed and failed on reruns, with and without this change; the machine was busy).
+
 ## 2026-10-24: the to-do list moved from NOTES.md to a kandown board (Claude Code)
 
 Request: initialize kandown (https://kandown.dev, 0.52.0) for the project, move all the notes

src/ui/session.js

@@ -5,6 +5,9 @@ function showLoading(on, p) {
   if (on) { $('loadbar').style.width = Math.round((p || 0) * 100) + '%'; $('loadtext').textContent = Math.round((p || 0) * 100) + '%'; }
 }
 function enterGame() {
+  $('cards').innerHTML = '';
+  if (R.floaters) R.floaters.length = 0; R.particles.length = 0;
+  GAME.status = ''; GAME.statusT = 0;
   $('title').hidden = true; $('hud').hidden = false;
   GAME.running = true; GAME.paused = false;
   buildSky(); resizeRender(); snapCamera();

test/play.py

@@ -45,6 +45,7 @@ with sync_playwright() as p:
         if not pg.is_visible('#nw-seed'): pg.click('#btn-new')
         pg.fill('#nw-seed', str(seed)); pg.click('#btn-generate')
         pg.wait_for_function('GAME.running', timeout=20000)
+        check(f'new world {seed} shows the Welcome card', pg.evaluate("[...$('cards').children].some(c => c.textContent.includes('Welcome'))"))
         pg.evaluate('quitToTitle()')
         pg.wait_for_function("!$('title').hidden")
     pg.click('#btn-worlds'); pg.locator('#m-worlds').wait_for(state='visible')
@@ -61,6 +62,7 @@ with sync_playwright() as p:
         row = pg.locator(f'[data-world="{ids[str(seed)]}"]')
         row.get_by_role('button', name='Load', exact=True).click(); pg.wait_for_function('GAME.running')
         check(f'Load switches to seed {seed}', pg.evaluate('worldSeed') == seed and pg.evaluate('GAME.worldId') == ids[str(seed)])
+        check(f'loading seed {seed} shows no cards left from another world', pg.evaluate("$('cards').children.length") == 0)
         pg.evaluate('quitToTitle()'); pg.click('#btn-worlds')
     row = pg.locator(f'[data-world="{ids["222"]}"]')
     row.get_by_role('button', name='Rename', exact=True).click()