fix: allow bun.lock regeneration on manual workflow dispatch

Delete bun.lock to force regeneration. The workflow now only uses
--frozen-lockfile on push events, allowing manual triggers to
regenerate the lockfile when Dependabot updates package-lock.json.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: robcohen

.github/workflows/deploy.yml

@@ -29,7 +29,7 @@ jobs:
               run: bun add @rustledger/wasm@latest
 
             - name: Install dependencies
-              run: bun install ${{ github.event_name == 'repository_dispatch' && '' || '--frozen-lockfile' }}
+              run: bun install ${{ github.event_name == 'push' && '--frozen-lockfile' || '' }}
 
             - name: Copy WASM from npm package to pkg/
               run: |