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28 commits this week May 11, 2026 - May 18, 2026
chore(nix): update `flake.lock`
Flake lock file updates:

• Updated input 'advisory-db':
    'github:rustsec/advisory-db/881a159' (2026-05-07)
  → 'github:rustsec/advisory-db/f2ae5fc' (2026-05-16)
• Updated input 'blockfrost-tests':
    'github:blockfrost/blockfrost-tests/dac734c' (2026-05-15)
  → 'github:blockfrost/blockfrost-tests/7c8dfa8' (2026-05-15)
• Updated input 'fenix':
    'github:nix-community/fenix/f54d645' (2026-05-09)
  → 'github:nix-community/fenix/ecd6d4f' (2026-05-16)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/73ca1d4' (2026-05-08)
  → 'github:rust-lang/rust-analyzer/1a68212' (2026-05-15)
• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/0678d89' (2026-05-05)
  → 'github:hercules-ci/flake-parts/f7c1a2d' (2026-05-13)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/0c88e1f' (2026-05-05)
  → 'github:nixos/nixpkgs/d7a713c' (2026-05-14)
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