Add scenario runner seam for runtime summaries

[Pan14ek]

Purpose

Add a reproducible scenario-runner seam for local runtime experiment evidence generation.

Type

• 🧪 Experiment (fitness function research)
• ✨ Feature (new business logic)
• 🐛 Bug fix
• ♻️ Refactor / neutral change
• 📝 Documentation only

Changes

This PR adds a no-dependency Node scenario runner that accepts one deployment scenario and one k6 workload, coordinates Kubernetes/k6 adapters, and writes sanitized runtime-summary artifacts for collector ingestion.

The runner preserves backend business behavior. It does not add runtime-aware scoring, SLO classification, Cosmos writes, cluster creation, image loading, secrets handling, or production monitoring.

Files changed

File	Change
load-tests/runtime-scenarios/*.mjs	Add CLI, runner seam, k6 adapter, Kubernetes adapter, command runner, runtime summary builder, and unit tests.
docs/runtime-scenario-summaries.md	Document supported inputs, runner workflow, safety rules, artifact contract, validation, and cleanup.
docs/README.md	Add documentation routing for runtime scenario summaries.
docs/runtime-fitness-extension.md	Route runtime-summary generation through the scenario runner seam.
.beads/issues.jsonl	Track lined-51s scenario-runner seam work as in progress.

Expected result

Metric	Baseline (main)	Branch	Direction
checkstyle_violations			neutral
spotbugs_total			neutral
line_coverage			neutral
critical_violations			neutral
code_smells			possible increase
duplicated_lines_density			neutral
F score			unknown
SonarQube QG			expected pass

This is experiment tooling only. Structural fitness may move slightly because new test/tooling code and docs are added, but backend business logic is unchanged.

Verification

• ./gradlew check passes locally
• ./gradlew jacocoTestReport passes locally
• No unintended changes to main business logic
• Branch name matches experiment/feature naming convention

Additional checks run:

• node --test load-tests/runtime-scenarios/*.test.mjs
• node --check load-tests/runtime-scenarios/*.mjs
• git diff --check
• kubectl kustomize k8s/kind/scenarios/fixed-small
• kubectl kustomize k8s/kind/scenarios/fixed-medium
• kubectl kustomize k8s/kind/scenarios/replicas-2
• kubectl kustomize k8s/kind/scenarios/hpa-cpu

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud