chore(deps): bump grpc to 1.83.2

[santoshkumarradha]

Summary

Updates google.golang.org/grpc from 1.83.1 to 1.83.2 to pick up the patched release for the current high-severity Dependabot alert. go get also advances the coupled golang.org/x modules required by this gRPC release.

Validation

• cd control-plane && go mod verify
• cd control-plane && go vet ./...
• cd control-plane && go test ./... -count=1 -timeout=10m

All passed locally.

[github-actions]

📊 Coverage gate

Thresholds from .coverage-gate.toml: per-surface ≥ 84%, aggregate ≥ 85%, max per-surface regression ≤ 1.0 pp, max aggregate regression ≤ 0.50 pp.

Surface	Current	Baseline	Δ
control-plane	87.80%	87.40%	↑ +0.40 pp	🟡
sdk-go	93.10%	92.00%	↑ +1.10 pp	🟢
sdk-python	94.72%	93.73%	↑ +0.99 pp	🟢
sdk-typescript	91.72%	90.42%	↑ +1.30 pp	🟢
web-ui	84.76%	84.79%	↓ -0.03 pp	🟡
aggregate	85.88%	85.75%	↑ +0.13 pp	🟡

✅ Gate passed

No surface regressed past the allowed threshold and the aggregate stayed above the floor.

[github-actions]

📐 Patch coverage gate

Threshold: 80% on lines this PR touches vs origin/main (from .coverage-gate.toml:thresholds.min_patch).

Surface	Touched lines	Patch coverage	Status
control-plane	0	—	➖ no changes
sdk-go	0	—	➖ no changes
sdk-python	0	—	➖ no changes
sdk-typescript	0	—	➖ no changes
web-ui	0	—	➖ no changes

✅ Patch gate passed

Every surface whose lines were touched by this PR has patch coverage at or above the threshold.

[santoshkumarradha]

Superseded by #1055, which includes the same gRPC 1.83.2 update together with the remaining open security fixes and has green required checks.