Run bounded PHPUnit plans in one disposable runtime

[chubes4]

Summary

Add a generic bounded execution plan that owns one runtime and service lifecycle for many isolated commands.

What changed

• Add typed plan, entry, adapter, result, fail-fast, timeout, redaction, and selective-retry contracts.
• Guarantee deterministic result ordering, bounded process admission, and disposal after service cleanup failures.
• Extend the disposable MariaDB integration with two isolated PHPUnit-shaped entries sharing one allocation.

How to test

1. Run npm ci; expect Dependencies install successfully..
2. Run npm run test:bounded-runtime-plan; expect Deterministic scheduler and lifecycle assertions pass..
3. Run npm run test:run-plan-executor; expect Existing run-plan executor assertions pass..
4. Run npm run build; expect TypeScript packages build successfully..
5. Run npm run test:disposable-mysql-mysqli-e2e; expect On a Docker-capable host, MySQL/MariaDB recipes and the shared bounded allocation pass..

Compatibility

Additive public API only; existing single PHPUnit recipes, schemas, and extension paths are unchanged.

Evidence

• Base unchanged since verification: main remains at fcf43d7.
• CI expected: WP Codebox test suite
• Reviewer-resolvable source evidence: Run bounded PHPUnit plans in one disposable runtime #1920
• Verified finalization base: main at fcf43d7
• bounded-runtime-plan: Passed
• build: Passed
• run-plan-executor: Passed

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode
• Model: openai/gpt-5.6-terra
• Used for: Drafted implementation and tests; Chris reviews and owns the change.

Source relationships

• Closes Run bounded PHPUnit plans in one disposable runtime #1920