refactor(ci): migrate Python/Rust tasks to justfile and remove web: prefix

[sabertazimi]

Move all python:* and rust:* scripts from package.json to justfile,
removing pnpm/Node.js dependencies from Python and Rust CI jobs.
Rename web:* scripts to drop the web: prefix since Python/Rust
commands no longer live in package.json.

Pull Request

This PR Contains

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Test-Case

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

Breaking Changes

Additional Info

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Project	Deployment	Actions	Updated (UTC)
lab	Error		May 21, 2026 3:16am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.25%. Comparing base (ae0aa2f) to head (a6e6423).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1012   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files           7        7           
  Lines         286      286           
  Branches       59       59           
=======================================
  Hits          261      261           
  Misses          4        4           
  Partials       21       21           

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