[CI/CD] Hard bundle budget thresholds in CI (block regressions)

[nanaf6203-bit]

Problem Statement

next-bundle-analyzer is configured (scripts/run-analyze-build.mjs) but no hard budget exists. The size-limit.json is loose; no CI gate fires when a feature regresses the bundle.

Acceptance Criteria

• Hard limits: initial JS ≤ 220KB, web3-vendors ≤ 180KB, CSS ≤ 60KB
• The perf:budgets script returns non-zero when exceeded
• PRs with regressions are blocked; comments appear inline

Implementation Notes

Wire next-bundle-analyzer JSON into a custom check in scripts/check-performance-budgets.mjs.

Files Likely Affected

• scripts/check-performance-budgets.mjs
• .github/workflows/ci.yml
• .size-limit.json

Difficulty / Effort

• Difficulty: Moderate
• Effort: T-Shirt M

Labels

ci-cd, priority:high, area:performance

[AdaBebe0]

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[a-malik-gh]

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