fix(cloudflare): migrate wrangler.toml to Workers + Assets format (#248)

## Problem

The "Workers Builds: boj-server" check has been failing because:

1. **`pages_build_output_dir`** is not recognised by the
post-Pages-merger Cloudflare Workers build system. It interprets the
project as a Workers script deployment and looks for a JS entry point.
2. **No `[build] command=""`** — the Git Integration attempts to install
every runtime listed in `.tool-versions` (Zig 0.15.1, Elixir 1.18.4,
Idris2 0.8.0, Deno 2.7.14) before a build step that doesn't exist, then
fails.

(The `pages-deploy.yml` GitHub Actions fallback was written to work
around exactly this problem, but the Cloudflare Git Integration check
itself kept showing red.)

## Fix

- `wrangler.toml`: replace deprecated `pages_build_output_dir = "site"`
with the current Workers static-assets syntax:
  ```toml
  [assets]
  directory = "site"

  [build]
  command = ""
  ```
- `.github/workflows/pages-deploy.yml`: update fallback deploy from
deprecated `wrangler pages deploy` to `wrangler deploy`, consistent with
the new Workers format.

## Test plan

- [ ] Cloudflare Git Integration build succeeds (no `.tool-versions`
install attempt, no missing-entry-point error)
- [ ] `pages-deploy.yml` GitHub Actions fallback still deploys `site/`
correctly on push to main
- [ ] `site/` content and `_headers`/`_redirects` are unaffected

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01F8pqMfJViUaKabWKNQ9wUg

---
_Generated by [Claude
Code](https://claude.ai/code/session_01F8pqMfJViUaKabWKNQ9wUg)_

Co-authored-by: Claude <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/pages-deploy.yml

@@ -1,9 +1,10 @@
 # SPDX-License-Identifier: MPL-2.0
-# Fallback Cloudflare Pages deploy via Direct Upload (wrangler pages deploy).
-# Bypasses the Cloudflare build system entirely — no .tool-versions install
-# attempt, no `wrangler deploy` (Workers command) confusion.
+# Fallback Cloudflare Workers deploy via Direct Upload (wrangler deploy).
+# Bypasses the Cloudflare Git Integration build system entirely.
+# Uses wrangler deploy (Workers + Assets) rather than the deprecated
+# `wrangler pages deploy` now that wrangler.toml uses [assets] syntax.
 # Required secrets: CLOUDFLARE_API_TOKEN, CLOUDFLARE_ACCOUNT_ID
-name: Deploy to Cloudflare Pages
+name: Deploy to Cloudflare Workers
 
 on:
   push:
@@ -18,8 +19,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Deploy site/ to Cloudflare Pages
-        run: npx wrangler@latest pages deploy site/ --project-name=boj-server
+      - name: Deploy site/ to Cloudflare Workers (static assets)
+        run: npx wrangler@latest deploy
         env:
           CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}

wrangler.toml

@@ -1,7 +1,18 @@
 # SPDX-License-Identifier: MPL-2.0
-# Cloudflare Pages configuration for boj-server.net.
-# The site is a no-build static bundle; Pages serves the `site/` directory as-is.
+# Cloudflare Workers static-asset configuration for boj-server.net.
+# Migrated from Pages (pages_build_output_dir) to Workers + Assets format:
+# the old key is not recognised by the Workers build system post-Pages merger.
+#
+# [build] command="" prevents the Git Integration from attempting to install
+# .tool-versions entries (Zig, Elixir, Idris2, Deno) before a non-existent
+# build step. The site/ directory is deployed as-is with no build phase.
+# For the GitHub Actions fallback see .github/workflows/pages-deploy.yml.
 
 name = "boj-server"
 compatibility_date = "2026-06-24"
-pages_build_output_dir = "site"
+
+[assets]
+directory = "site"
+
+[build]
+command = ""