fix: docs - gas_budget.py path prefix + real CI badge (#122 #123)

[gtx20060124-bot]

Summary

Addresses #123 and #122:

1. docs (docs: fix missing switchboard/ path prefix for gas_budget.py in README table #123): Fixed missing switchboard/ path prefix for gas_budget.py in the What's in the box table. Was listed as gas_budget.py but should be switchboard/gas_budget.py to match the project structure.

2. docs (docs(readme): swap hard-coded tests-passing shield for real Actions badge #122): Replaced the static tests-passing badge (which was always green regardless of CI status) with the real GitHub Actions badge pointing to .github/workflows/ci.yml.

Changes

• README.md: Fixed gas_budget.py path in the module table
• README.md: Swapped hard-coded badge for real Actions badge

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

[abhicris]

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