[CI] Validate pull requests against the Genesis unit tests and benchmarks.

[duburcqa]

Issue: #

Brief Summary

Genesis is the main consumer of Quadrants, and its test suite and benchmarks exercise the compiler far beyond what the tests of this repository cover. This adds a Genesis workflow that validates every pull request against the default branch of Genesis, the way the Genesis repository validates its own pull requests against the Nyx plugin.

The workflow starts once "Manylinux wheel build" completes with success and calls the CI of Genesis itself, made reusable by Genesis-Embodied-AI/genesis-world#3371, on Genesis main installed with the wheel built from the revision under test:

• the minimal set of Genesis unit tests (required and not slow, dynamic array mode, GPU backend);
• every Genesis benchmark, in both dynamic array and field modes;
• the comparison of the benchmarks against the history of Genesis main, with the same script and tolerances as the Genesis CI, which comments on the pull request in case of regression or abnormal deviation. Nothing is uploaded to W&B.

The outcome is published as two checks on the commit under test: "Genesis Unit Tests & Benchmarks" and "Genesis Benchmark Comparison" (comparison tables).

Walkthrough

• The orchestration lives in production.yml and alarm.yml of the Genesis repository, called as reusable workflows. This file only carries the trigger, the run id of the wheel build, the test selection, and the publication of the check.
• The Genesis side vets the call (a pull request against the default branch of this repository, forks included), picks the wheel fitting its environment among the artifacts of the run, and routes the call to the one Genesis runner labelled for calls, so the other stays with the Genesis CI and calls queue in order. A newer revision of a pull request cancels its stale run here.

Prerequisites outside this repository:

• [MISC] Let dependent repositories run the production CI. genesis-world#3371 merged first;
• the genesis-world runner is registered at the repository level and must be moved to an organisation runner group granting this repository access, with one of the two runners carrying the external label.

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