fix(wasm): strip dead env import from wasm-bindgen JS

[jeanclawdbotdamn]

Summary

The playground still throws Failed to resolve module specifier "env" despite PR #40 providing Rust implementations for all 12 C stdlib functions.

Root cause: The build pipeline runs in this order:

1. cargo build → WASM binary (1 residual env import)
2. wasm-bindgen → generates JS with import * from "env"
3. wasm-opt → optimizes WASM binary, removes the dead import

So the final WASM has zero env imports, but wasm-bindgen already wrote the JS before wasm-opt ran. The JS has a dead reference the browser can't resolve.

Fix: Add a sed post-processing step after wasm-pack build in both pages.yml and release.yml to strip the dead import * from "env" and "env": lines.

Test plan

• CI passes
• After Pages deploy: open https://juanmarchetto.github.io/truss/ — no console errors
• Type workflow YAML — validation results appear

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.65%. Comparing base (7394162) to head (f11d7ea).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #41   +/-   ##
=======================================
  Coverage   77.65%   77.65%           
=======================================
  Files          50       50           
  Lines        4408     4408           
=======================================
  Hits         3423     3423           
  Misses        985      985           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.