v0.3.0

Changed

• Cloud block storage no longer costs 40 % of the scan. Scaleway SBS
  volumes (and virtualized block devices generally) report
  queue/rotational = 1 while being network-attached flash; camembert
  believed them, dropped to the 2-worker rotational tier, and engaged
  io_uring on top. A rotational flag of 1 is now cross-checked against
  the device's active I/O scheduler and disbelieved when the kernel left
  none scheduling active — a combination the kernel never produces for a
  real spinning disk. Measured on a 2-vCPU cloud instance, 100k entries:
  ext4 warm 340 → 210 ms, cold 1840 → 1017 ms; XFS warm 379 → 178 ms, cold
  2122 → 968 ms. A real HDD, and any device whose queue/scheduler cannot
  be read, keeps the rotational tier.
• --statx-engine auto now resolves to sync at every worker count.
  io_uring batching measured 12-21 % faster at ≤ 2 workers on the
  development machine and 1.2-1.7× slower at every worker count from 1
  to 8 (warm and cold, ext4/XFS/btrfs/f2fs) on cloud block storage. With
  the evidence pointing both ways, the default takes the engine that is
  never the slow one; --statx-engine io_uring still forces the other.

Fixed

• camembert … --no-ui | head no longer panics. The Rust runtime
  leaves SIGPIPE ignored, which turned a closed stdout into a write
  error and a panic (stack trace, exit 101) where every other tool in a
  pipeline exits quietly; the default disposition is now restored at
  startup. The dump is also written before any summary text, so a
  truncated pipeline costs the reader nothing but the text they stopped
  reading.

Added

• Man pages — camembert-mangen <OUT_DIR> renders camembert.1 (plus
  one page per subcommand) from the same clap definitions the binary parses
  with, so the manual cannot drift from --help.
• CAMEMBERT_GIT_SHA is honored at build time — set it and --version
  reports that commit instead of unknown, which is what a distro packager
  building from a .git-less tarball needs.
• Declared MSRV: Rust 1.88, the floor the dependency graph already
  imposed. A CI job builds against exactly that version, so raising it has
  to be deliberate.
• AUR packaging — packaging/aur/ holds the PKGBUILD and the runbook
  for publishing and updating it. Not published yet; it needs a release
  containing the man-page generator.

Full Changelog: v0.2.0...v0.3.0