✨ Add missing TKET RL actions

[flowerthrower]

🤖 AI text below 🤖

Description

Adds the missing TKET actions used by the paper prototype:

• KAKDecomposition optimization;
• GraphPlacement layout; and
• NoiseAwarePlacement layout.

The placement actions translate TKET placement maps into complete Qiskit TranspileLayout values through the existing layout pipeline. TKET layout and routing actions are masked for circuits containing operations wider than two qubits.

This draft is stacked on the BQSKit pass PR. Validated with repository lint, placement smoke checks, and focused invariant checks.

Part of #664

Checklist

• The diff is focused and follows existing action patterns.
• Lint passes.
• I confirm that I have personally reviewed and understood all AI-generated content.

If PR contains AI-assisted content:

• AI assistance was authorized and is disclosed.
• This body begins with the required visible disclosure.

[flowerthrower]

🤖 AI text below 🤖\n\nSuperseded while rebuilding the corrected downstream stack after #758.