I've updated the repository to commit 3bbeb6fbfa5b89e394316a335035a3783577d7fe of keiiscoming/hamster-tower, and the export build works. Nothing has been committed or published yet.

What changed (staged, 18 files): client/ (including the new client/sound.js), scripts/build.js, tests/api.test.js, tests/flow.js, vercel.json, README.md, and the new files in public/fonts/ and public/brand/. I checked every file in those paths byte for byte against the upstream commit, on disk and in the index, and all match. No extra files are left in those paths.

This machine's git setting converts line endings to Windows style, so the first checkout left the files on disk different from upstream even though git showed no difference. I wrote the upstream files out directly so they match exactly. I didn't change the git setting.

Build check: npm install && npm run export finished and wrote dist/index.html, dist/app/, dist/art/, dist/fonts/ (5 woff2 files plus the two font licences) and dist/brand/ (og.jpg, icon-180.png). All asset paths in index.html are relative, the fonts are linked as ../fonts/…, and the bundle calls https://hamster-tower-game.vercel.app from the unchanged site.config.json. I didn't run the test suites; they need a database or a browser.

Put back the way they were:

• dist/ is tracked in this repository but isn't one of the listed paths. The build overwrites it, so I restored the committed copy after checking the output. The hosting step needs to run npm run export itself and not use the committed dist/.
• npm install changed the Node version range in package-lock.json (>=22 became >=22 <25). I reverted that.

Left as is, as the brief says:

• Keeping a guest save with a wallet may not work yet. It depends on server code (a new claimGuest in lib/players.js and changes to lib/router.js) that is in the upstream commit but was left out here. The hosted page calls whatever is deployed at hamster-tower-game.vercel.app, so this works only if that server is already on the new version. tests/api.test.js now tests this server code, so it may fail against this repository's lib/ until that is updated.
• .gitignore upstream now ignores dist/. That file is outside the listed paths, so I didn't change it.
• The link preview image points to https://hamster-tower-game.vercel.app/brand/og.jpg, so previews work only once the server deployment serves /brand/.

The static copy of Hamster Tower at commit 3bbeb6fbfa5b89e394316a335035a3783577d7fe is built into dist/ and staged, but not committed: git has no author name or email set on this machine. I didn't set one myself, because the earlier imd … commits were made by the pipeline's own worker account.

• Package manager: npm (the repo has package-lock.json). I installed with npm ci, which installs exactly what the lockfile pins.
• Build command: npm run export, which runs node scripts/build.js --export. It reads the server address from site.config.json (https://hamster-tower-game.vercel.app).
• Output: the script wrote straight to dist/ at the repository root: dist/index.html, plus app/app.8eed309390.js, app/app.846b72ec89.css, and the art/, fonts/ and brand/ folders. The total is 2.9 MB, well under the 8 MiB limit. I checked that the staged files are byte-identical to what the build wrote.

Things to know:

• Step 1 had nothing to change. client, scripts, tests, public/fonts, public/brand, vercel.json and README.md were already identical to the target commit; an earlier contributor applied it. package.json, package-lock.json, site.config.json and shared match too. The only differences are in lib/ (left alone, as instructed) and .gitignore.
• .gitignore was not changed. The upstream commit adds a dist/ line to it. I didn't add it, because that would stop the export from being committed and hosted.
• Nothing outside dist/ changed. No source, configuration, lockfile or dependency was touched, and there is no .well-known file.
• Asset paths are relative, except the link preview image. The build points its meta tags at the full address https://hamster-tower-game.vercel.app/brand/og.jpg. That is how the repository builds it, so I left it as it is.

I found nothing critical or high, so nothing in this update should stop it from being hosted. I recorded two minor findings in .imd-findings.json and changed no other files.

What I checked

• Source matches the commit: every listed path is byte-identical to upstream commit 3bbeb6f. So are shared/, public/art, site.config.json and the package files. The update was already in the working tree.
• dist/ matches the source: I rebuilt it with npm install && npm run export in a separate temporary copy. The result is byte-identical to the dist/ in the repo, including app.8eed309390.js and app.846b72ec89.css, so the minified bundle comes only from the source I read.
• Pages and scripts: I read index.html, the whole of sound.js, and ui.js for its server calls, the wallet sign-in, the guest flow and every place it writes HTML. For fx.js, map.js, shared/*.js and the stylesheet I searched for risky calls rather than reading every line.
• Wallet sign-in: the page only asks a wallet for its account and a signature on the game's own sign-in message (client/ui.js:141-149). Before asking, it checks that the server's message starts with "Sign in to Hamster Tower", names the wallet's address and ends with "costs nothing and sends no transaction". There are no approvals, permits or transactions.
• Nothing hidden or loaded from elsewhere: there is no eval, no code loaded from another site, no iframe, no silent redirect and no tracking. Network calls go only to the server named in site.config.json. The only outside links are MetaMask, Rabby, a Trust Wallet "open in app" link and Etherscan, and the page labels each one plainly.
• Assets: the stylesheet only loads local art and fonts. The fonts ship with their OFL licences. The link preview image is the game's own art, with no other organisation's brand on it.
• Server: the live server's own copy of the game already includes the new "keep a guest save with a wallet" feature, so the hosted copy shouldn't depend on a server change that isn't live. lib/ stays as it is, as asked.

Findings

1. Low, dist/index.html:12 (also lines 13 and 20): the link preview tags point at hamster-tower-game.vercel.app, not the hosted name. A shared ENS link will show the Vercel address in previews.
2. Info, client/ui.js:1465: if the game fails to start, the server's error text is inserted into the page as HTML instead of plain text. Only the game's own server can supply that text, so visitors can't exploit it. It's a hardening note, and it matters slightly more on IPFS because the security headers in vercel.json don't apply there.