feat(diagnostics): add bounded counter summary

[brentthomas248]

Closes #1738

Summary

• add a public get_diagnostics_summary entrypoint returning compact protocol counters for off-chain scrapers
• count invoice status buckets through existing indexes and bound active bid, open dispute, and held escrow scans with a documented scan limit/truncation flag
• add focused tests for empty protocol state and active bid -> funded/disputed/held escrow transitions
• include narrow baseline CI repairs needed for the current repository state to compile, lint, test, and run the wasm size gate

Verification

• PATH="/Users/brentthomas1/.cargo/bin:/Users/brentthomas1/.codex/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.13/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/pkg/env/global/bin:/Library/Apple/usr/bin:/Users/brentthomas1/.codex/tmp/arg0/codex-arg0F2qOjC:/Users/brentthomas1/.cache/codex-runtimes/codex-primary-runtime/dependencies/bin:/Users/brentthomas1/.bun/bin:/Users/brentthomas1/.codex/bin:/Users/brentthomas1/.local/bin:/Users/brentthomas1/bin:/Users/brentthomas1/.npm-global/bin:/Users/brentthomas1/.lmstudio/bin:/Applications/Codex.app/Contents/Resources" cargo test -p quicklendx-contracts diagnostics_summary -- --nocapture
• PATH="/Users/brentthomas1/.cargo/bin:/Users/brentthomas1/.codex/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.13/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/pkg/env/global/bin:/Library/Apple/usr/bin:/Users/brentthomas1/.codex/tmp/arg0/codex-arg0F2qOjC:/Users/brentthomas1/.cache/codex-runtimes/codex-primary-runtime/dependencies/bin:/Users/brentthomas1/.bun/bin:/Users/brentthomas1/.codex/bin:/Users/brentthomas1/.local/bin:/Users/brentthomas1/bin:/Users/brentthomas1/.npm-global/bin:/Users/brentthomas1/.lmstudio/bin:/Applications/Codex.app/Contents/Resources" cargo clippy -p quicklendx-contracts --all-targets -- -D warnings
• git diff --check
• PATH="/Users/brentthomas1/.cargo/bin:/Users/brentthomas1/.codex/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.13/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/pkg/env/global/bin:/Library/Apple/usr/bin:/Users/brentthomas1/.codex/tmp/arg0/codex-arg0F2qOjC:/Users/brentthomas1/.cache/codex-runtimes/codex-primary-runtime/dependencies/bin:/Users/brentthomas1/.bun/bin:/Users/brentthomas1/.codex/bin:/Users/brentthomas1/.local/bin:/Users/brentthomas1/bin:/Users/brentthomas1/.npm-global/bin:/Users/brentthomas1/.lmstudio/bin:/Applications/Codex.app/Contents/Resources" cargo test --verbose
• PATH="/Users/brentthomas1/.cargo/bin:/Users/brentthomas1/.codex/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.13/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/pkg/env/global/bin:/Library/Apple/usr/bin:/Users/brentthomas1/.codex/tmp/arg0/codex-arg0F2qOjC:/Users/brentthomas1/.cache/codex-runtimes/codex-primary-runtime/dependencies/bin:/Users/brentthomas1/.bun/bin:/Users/brentthomas1/.codex/bin:/Users/brentthomas1/.local/bin:/Users/brentthomas1/bin:/Users/brentthomas1/.npm-global/bin:/Users/brentthomas1/.lmstudio/bin:/Applications/Codex.app/Contents/Resources" quicklendx-contracts/scripts/check-wasm-size.sh

Notes

• cargo fmt --check is still blocked by broad pre-existing repository formatting drift across untouched files, so I did not run whole-repo rustfmt and avoided unrelated formatting churn.