build(deps): require circulax>=0.2.3

[jackgdsf]

Closes #321.

Adds circulax>=0.2.3 as a runtime dependency and refreshes uv.lock. The si220 cband PDK already imports circulax optionally for its active (electro-optic) models, so making it a hard dependency means ThermalPhaseShifter and friends are always registered in the PDK models dict.

Branched off current main so the earlier attempt's CI failures don't recur — those were all stale-base artifacts (template drift deleting .github/release-drafter.yml / auto-label-pdk.yml mid-run, and test_models_with_wavelength_sweep missing the non-SAX-model skip that is now on main).

Validation (local, Python 3.12)

• pre-commit run --all-files with the canonical PDK config: all 27 hooks pass
• make test equivalent, each file in its own pytest process as CI does:
  • test_si220_cband.py 296 passed, 3 skipped
  • test_si220_oband.py 288 passed, 2 skipped
  • test_routing.py 4 passed
  • test_si340.py 268 passed
  • test_sin200.py 268 passed
  • test_ge_on_si.py 36 passed
  • test_si_sus.py 42 passed
  • test_active_models.py 5 passed (previously skipped via importorskip, now actually exercised)
• uv lock diff is minimal: adds circulax 0.2.3 plus its transitive deps (diffrax, equinox, lineax, optimistix) and syncs the stale cspdk version entry 1.4.4 -> 1.4.5

No test files were modified.

Requested by @joamatab.

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Note: this PR was prepared by an AI agent. A human must review the actual code changes before merge.

Summary by Sourcery

Make circulax a required runtime dependency and update the lockfile to support consistent active-model registration.

Enhancements:

• Require circulax 0.2.3 or newer at runtime so the si220 cband PDK's active models are consistently available.

Build:

• Refresh the uv lockfile with circulax and its transitive dependencies, and synchronize the cspdk version entry.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adds circulax>=0.2.3 as a required runtime dependency and refreshes the uv.lock file to incorporate circulax and its transitive dependencies, ensuring active models like ThermalPhaseShifter are always registered and tested.

File-Level Changes

Change	Details	Files
Add circulax as a required runtime dependency in the project configuration.	Update the dependencies list to include circulax with minimum version 0.2.3 Ensure circulax is treated as a hard dependency rather than an optional import for active PDK models	pyproject.toml
Regenerate the uv.lock file to reflect the new circulax dependency and synchronize package versions.	Add lock entries for circulax 0.2.3 and its transitive dependencies (diffrax, equinox, lineax, optimistix) Update the locked cspdk version from 1.4.4 to 1.4.5 Keep the lockfile otherwise in sync with the current dependency graph	uv.lock

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#321	Update the project to require circulax version >=0.2.3 as a dependency in the PDK.	✅

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