feat: sync orchestrator 2.0 API

[loks0n]

Summary

• remove the retired public deployment-pool and activation SDK surface
• make sandbox creation use a complete image/port shape for transparent warm-pool matching
• expose termination grace periods for deployments and sandboxes
• update sandbox status, callback events, tests, and documentation for orchestrator 2.0

Validation

• composer test
• composer analyze
• composer format:check
• composer refactor:check

[greptile-apps]

Greptile Summary

This PR synchronizes the PHP SDK with orchestrator 2.0.

• Removes the retired deployment-pool, activation, and pool-backed sandbox surfaces.
• Requires sandboxes to declare their complete image and primary-port shape.
• Adds termination grace-period request fields for deployments and sandboxes.
• Updates sandbox status hydration, callback events, tests, and documentation.

Confidence Score: 5/5

The PR appears safe to merge, with the removed and updated public surfaces consistently reflected across implementation, models, tests, and documentation.

No concrete blocking or independently actionable non-blocking defect remains after checking the new request mappings, sandbox contract changes, retired pool APIs, and callback behavior.

Important Files Changed

Filename	Overview
src/Sandboxes.php	Replaces pool-or-image creation with required image and port inputs, adds termination-grace serialization, and removes pool inspection methods consistently with the documented 2.0 surface.
src/Deployments.php	Adds optional terminationGracePeriodSeconds to deployment specifications using the existing nullable optional-field serialization pattern.
src/Model/SandboxStatus.php	Removes poolId hydration in alignment with transparent warm-pool matching and updated response fixtures.
src/Enum/CallbackEvent.php	Removes the retired pool activation event while preserving support for arbitrary callback event strings through the callback model.
src/DeploymentPools.php	Deletes the retired deployment-pool client as part of the coordinated orchestrator 2.0 API removal.
tests/SandboxesTest.php	Migrates sandbox coverage to the complete image-and-port request shape and verifies termination-grace serialization.
tests/DeploymentsTest.php	Extends deployment request coverage to verify terminationGracePeriodSeconds serialization.

_{Reviews (1): Last reviewed commit: "feat: sync orchestrator 2.0 API" | Re-trigger Greptile}