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37 commits this week May 08, 2026 - May 15, 2026
chore: drop `x86_64-darwin` support
Approved by @mmahut [on Slack](https://input-output-rnd.slack.com/archives/C07FD0DNEMQ/p1778241133251339).

Apple stopped shipping Intel Macs in 2023 and Homebrew has dropped
official support. Remove `x86_64-darwin` from the flake systems list,
release workflow, curl-bash installer, Homebrew formula, and all Nix
derivations that referenced Intel macOS archives or hashes.
fix(gateway): use semaphore for Hydra capacity to prevent a TOCTOU race
@vladimirvolek notes that it's possible to DoS the `/sdk/ws` endpoint on
the Gateway now.

As the second part of the solution, replace the `Arc<Arc<()>>`
reference-counting approach with a `tokio::sync::Semaphore` so that
in-flight key exchanges count against the `max_concurrent_hydra_nodes`
limit.

This prevents concurrent connections from bypassing the capacity check
and triggering unbounded `hydra-node gen-hydra-key` subprocess spawns.

Follow-up to:
- #564
- 40bce2f2090b7a7834f5bc94e35247281b1fb4db