nixception v0.6.1

nixception 0.6.1

This release fixes two regressions introduced by an unrelated commit back in
July whose "sync tools/ up to the current nixpkgs-fork versions" went
backwards — the nixpkgs fork's copy was actually older, so the sync silently
reverted work that had landed just days earlier. One of the two reverted
pieces (an executable-bit fix) was caught and restored in v0.6.0; these two
were not.

Highlights

• Cache-hit/miss reporting was wrong for every action. The runner had
  stopped writing $out/timing.json, and nixception's cache classification
  treats a missing timing record as proof of a cache hit — so with the file
  never written, every action was reported as cached, regardless of whether
  it actually executed. A freshly cache-cleared, multi-second-long compile
  would print "Execution: none (all actions were cached)" and a 100% hit
  rate. Timing instrumentation (setup/task/wrap-up/nix→runner latency)
  is restored, so both the cache accounting and the "Command execution"
  breakdown in the timing summary are accurate again.
• NIXCEPTION_LOG was not honored. The setup hook had been quietly
  demoted to setting only RUST_LOG, even though the server's own main()
  bridges NIXCEPTION_LOG into RUST_LOG and documents it as taking
  precedence. Anyone with RUST_LOG already set in their environment for
  other tooling would have that value silently used for nixception too,
  instead of NIXCEPTION_LOG. The hook now checks NIXCEPTION_LOG first,
  matching the server's documented precedence.

See the changelog for the full list.

Licensing

The nixception sources are licensed under Apache-2.0. Binary distributions
of the server are additionally governed by GPL-3.0 through the statically
linked nix-compat crate — see NOTICE for full attribution and
licensing details.

Full Changelog: v0.6.0...v0.6.1