land: load-matrix-local-bridge

[aft-alfonso]

Accepted agent delivery; branch-keyed search descriptor included.

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Summary by cubic

Load-matrix tests now make matrix hosts install @cortexkit/aft-bridge packed from this checkout instead of resolving it from the registry, so the matrix exercises the current bridge, and the beta-pin gate fetches the pinned subc-core binary so the subc daemon row runs instead of skipping.

• Adds a test asserting both matrix hosts install the workspace bridge version.
• Moves the beta-pin gate to ubuntu-24.04 and supplies the fetched pinned binary via SUBC_CORE_BIN with SUBC_CORE_WIRE_VERSION=2.
• Adds a non-ranking harness descriptor for search-quality benchmarking.

^{Written for commit 4cddca4. Summary will update on new commits.}

Confidence Score: 5/5

The PR appears safe to merge; no blocking issues were found.

Summary

The PR makes both matrix hosts install the bridge packed from this checkout and adds a test for that setup.

Since the previous review:

• Both load-matrix hosts install the bridge packed from this checkout.
• The Beta-pin gate runs its matrix with a pinned wire-v2 daemon.
• The benchmark can label this delivery as a non-ranking harness slice.

No new actionable issues were found.

_{Reviews (2) · Last reviewed commit: "mason: wire pinned subc-core into beta-p..." · Reviewed by Greptile}