refactor(nox): table-drive provider sessions

[Abhijeet Prasad (AbhiPrasad)]

resolves #900

Summary

• Register routine provider nox sessions from compact declarative specs while preserving session IDs and version matrices.
• Share Python and OS compatibility constraints between nox and the shard planner, filtering sessions that will skip on the target CI job.
• Pass the CI Python and OS matrix values to the shard planner.

Validation

• Focused matrix tests passed before the test file was removed at the user's request.
• Ruff checks and repository pre-commit hooks passed.
• retained existing session IDs; Python/OS shard dry runs showed filtering.
• passed.

[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T18:22:22.533123Z	752913e	New commits

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[chatgpt-codex-connector]

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Reviewed commit: 85553485ae

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[chatgpt-codex-connector]

Preserve LiveKit runs when the server is installed

On Windows or macOS hosts where livekit-server is installed on PATH, this platform constraint makes _skip_if_incompatible() exit before _ensure_livekit_server() can use the executable. That function intentionally checks PATH before applying its non-Linux fallback and explicitly directs local users to install the server, so the new shared constraint removes previously supported local integration coverage; apply the Linux-only restriction only in CI sharding or retain the existing PATH-aware behavior.

AGENTS.md reference: AGENTS.md:L136-L141

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