fix: preserve tool budget on unknown tools

[alexsmolya]

Summary

• Resolve the requested tool before consuming the task's tool-call budget.
• Preserve the existing max-call enforcement and typed TOOL_NOT_FOUND errors.
• Add regressions proving unknown lookups do not consume budget and that a valid call can follow one with maxToolCallsPerTask: 1.

Validation

• Focused ActionExecutor tests: 10/10 passed.
• npm run build: passed.
• npm run verify: format check, lint, and typecheck passed.
• The full test phase recorded 227 passing tests and one unrelated pre-existing failure in tests/memory/in-memory-memory-store.property.test.ts: RangeError: Invalid time value from the existing fc.date().map((d) => d.toISOString()) fixture. The full suite is not being represented as green.

Fixes #256