feat: lease TestStand harness instances into execution cells (#1905)

[svelderrainruiz]

Issue Linkage

• Primary issue: [runner]: formalize opt-in self-hosted LV32/NI capability contract #1905
• Issue title: [runner]: formalize opt-in self-hosted LV32/NI capability contract
• Issue URL: [runner]: formalize opt-in self-hosted LV32/NI capability contract #1905
• Standing priority at PR creation: No
• Base branch: issue/upstream-1905-concentrator-execution-topology
• Head branch: issue/upstream-1905-teststand-harness-instance-lease
• Template variant: workflow-policy
• Auto-close intent: add Closes #... manually only when merge should resolve the linked issue.

Summary

Describe the workflow, policy, or governance outcome and the operator-facing reason for the change.

Agent Metadata (required for automation-authored PRs)

• Agent-ID: agent/copilot-codex-a
• Operator: @svelderrainruiz
• Reviewer-Required: @svelderrainruiz
• Emergency-Bypass-Label: AllowCIBypass

Workflow and Policy Impact

• Workflows, jobs, or tasks touched:
• Check names, required-status contracts, or merge-queue behavior affected:
• Permissions, rulesets, labels, reviewer routing, or approval surfaces changed:
• Manual dispatch, comment command, or branch-protection effects:

Validation Evidence

• Commands run:
  • ./bin/actionlint -color
• Contract, schema, or guard tests:
  • node --test ...
• Live workflow or dry-run evidence:
  • tests/results/...

Rollout and Rollback

• Rollout notes:
• Rollback path:
• Residual risks:

Reviewer Focus

• Please verify:
• Policy assumptions to double-check:
• Follow-up issues or guardrails:

[svelderrainruiz]

Stacked behind #1925 for issue #1905.

This slice makes the TestStand harness instance a first-class leased runtime surface instead of only inferred execution-cell metadata.

Included:

• tools/priority/teststand-harness-instance-lease.mjs
• new harness-instance lease/report schemas
• harness lease consumption in tools/TestStand-CompareHarness.ps1
• generated session schema support for harnessInstance.leaseId / leasePath
• focused Node + Pester coverage

Validation passed:

• node --test tools/priority/__tests__/teststand-harness-instance-lease.test.mjs tools/priority/__tests__/teststand-harness-instance-lease-schema.test.mjs tools/priority/__tests__/teststand-compare-session-schema.test.mjs
• Invoke-Pester tests/TestStand-CompareHarness.Tests.ps1 -Output Detailed
• node tools/npm/run-script.mjs session:teststand:validate
• node tools/npm/run-script.mjs docs:manifest:validate
• git diff --check

Budget hook: blended lower bound $0.020100; operator $0.000000 of $50000.000000 cap (remaining >=$50000.000000); window invoice-turn-2026-03-HQ1VJLMV-0027 spent $0.020100 remaining $399.979900; turns 1 total (0 live, 0 background); 1 turn(s) still pending labor timing; calibration reserve $100.000000 across 1 held window(s). Receipt: tests/results/_agent/cost/github-comment-budget-hook.json.