✨ Add missing TKET RL actions

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Description

Adds the TKET actions used by the paper prototype but missing from the production registry: KAKDecomposition, GraphPlacement, and NoiseAwarePlacement.

The placement actions translate TKET placement maps into complete Qiskit layouts through the existing layout pipeline. NoiseAwarePlacement receives mean one- and two-qubit gate errors per node and link, while measurement errors are excluded from those averages and supplied separately as readout errors. Registered TKET layout actions must provide exactly one Placement.

TKET layout and routing actions are masked for circuits containing operations wider than two qubits.

Focused tests cover calibration aggregation, wide-operation masking, real graph and noise-aware placement, KAK semantics, and the public placement boundary. Adjacent layout and registration tests and the lint suite pass.

Existing RL models must be retrained because the action schema changes.

This is position 5 of the stack. It depends on #795 and is followed by #797. No new package dependencies are introduced.

Part of #664

Checklist

• The pull request only contains commits that are focused and relevant to this change.
• I have added appropriate tests that cover the new/changed functionality.
• I have updated the documentation to reflect these changes.
• I have added entries to the changelog for any noteworthy additions, changes, fixes, or removals.
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• I have reviewed my own code changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between bb3ce81 and 65c9d98.

📒 Files selected for processing (5)

• CHANGELOG.md
• UPGRADING.md
• src/mqt/predictor/rl/actions/registry.py
• src/mqt/predictor/rl/actions/tket_actions.py
• src/mqt/predictor/rl/predictorenv.py

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