feat(platform): add phase8 100k production readiness gates

[ActiveInAI]

Summary

Upgrades Phase 8 into production-readiness gates for first-day 100k concurrent user preparation.

Scope

• Adds Phase 8 100k scale readiness baseline.
• Adds production runtime guards in Rust.
• Adds production scale config contracts.
• Adds production object-store guard.
• Adds request body limit wiring.
• Adds rate-limit skeleton with structured 429 responses.
• Adds JSON /readyz readiness output.
• Adds /metrics contract.
• Adds strict tech radar mode where fetch_failed rows fail non-zero.
• Adds Python tests for strict and non-strict tech radar behavior.
• Adds production-readiness smoke script.
• Adds proprietary runtime guard.
• Updates k6 thresholds.
• Updates K8s gateway Phase 8 config environment variables.
• Clusters NATS JetStream replicas.
• Enables Qdrant multi-replica cluster mode wiring.
• Updates docs to require strict tech radar for production stack approval.

Latest Fix

• 2e6ba91 fix(infra): cluster phase8 nats and qdrant manifests

Validation

• rm -f 04-backend/openapitools.json
• git diff --check
• bash -n 04-backend/scripts/smoke-phase8-scale.sh
• bash -n 04-backend/scripts/load-phase8-100k.sh
• bash -n 04-backend/scripts/smoke-phase8-production-readiness.sh
• docker compose -f docker-compose.phase8-scale.yml config
• kubectl kustomize infra/k8s/phase8
• python3 tools/github_tech_radar.py --strict --seed config/tech-radar.seed.yaml --out /tmp/tech-radar-phase8.md
• python3 -m unittest tools/test_github_tech_radar.py
• 04-backend/scripts/smoke-phase8-production-readiness.sh
• cargo fmt --all -- --check
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test --all-targets --all-features
• cargo build --release --bin insomeos-gateway

Environment Fact

k6 is not installed locally. The production-readiness script skipped k6 JavaScript syntax inspection as designed. k6 scripts and thresholds are included for CI/nightly/external load-test execution.

Boundary

This PR does not certify the platform for 100k production traffic yet. It adds mandatory runtime guards, validation gates, config contracts, readiness/metrics surface, load-test scripts, and infra baseline required before real external 100k load validation.

No proprietary RealBIM / BlackHole / OptRapid runtime asset is imported into open-source core.

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