ci: add bytecode comparison workflow

[drappi-ai]

Summary

• Adds .github/workflows/bytecode-compare.yml that verifies deterministic bytecode compilation across CLI and standard-json compiler interfaces
• Builds ssolc once (Debug, same config as test.yml), then runs prepare_report.py for each of the 4 presets with both --interface cli and --interface standard-json in a matrix strategy
• Compares the CLI and standard-json reports for each preset using diff, failing the job if they differ
• Uploads both reports as artifacts on failure for debugging

Test plan

• Verify workflow triggers on PRs and pushes to seismic
• Confirm build job completes and uploads the ssolc binary artifact
• Confirm all 4 preset matrix jobs run and reports match
• Verify failure artifacts are uploaded when reports differ