feat(v0.22): FS warn + battle-test matrix + USB docs platform split (Track C)
1. Filesystem type detection (architect P2 finding)
_primitives/_rust/keisei/src/fs_type.rs (NEW, 103 LOC)
- statfs(2)-based detection on unix (libc = '0.2' under
[target.'cfg(unix)'.dependencies])
- Recognizes exfat / msdos (FAT32) via f_fstypename on macOS,
via f_type magic numbers on Linux (0x4d44, 0x2011bab0)
- Windows stub returns Unknown (GetVolumeInformationW TBD)
- warn_on_unsafe_fs(root) emits stderr warning on ExFat/Fat32
brain.rs::load calls warn_on_unsafe_fs after canonicalize+symlink
checks. Warning NOT fatal — user can opt into single-client use.
2. Battle-test matrix (architect P3 finding)
tests/battle/Dockerfile.install-test-alpine (NEW)
- alpine:3.19 + apk rust/cargo/pandoc
- Exposes musl-vs-glibc issues in aws-sdk-s3, rusqlite, git2
tests/battle/Dockerfile.install-test-debian (NEW)
- debian:12 + rustup stable + pandoc
- Default server distro, different apt structure from Ubuntu
tests/battle/README.md rewritten — 3-distro matrix with run script
3. USB-BRAIN-GUIDE platform split
docs/USB-BRAIN-GUIDE.md — restructured as TOC + platform-agnostic
preamble + exFAT warning + cross-platform troubleshooting
docs/USB-BRAIN-GUIDE-macos.md (NEW, 97 LOC) — Gatekeeper, diskutil,
/Volumes, xattr -d com.apple.quarantine
docs/USB-BRAIN-GUIDE-linux.md (NEW, 98 LOC) — /media/$USER,
umount, ext4 recommended, systemd-udev auto-mount note
docs/USB-BRAIN-GUIDE-windows.md (NEW, 115 LOC) — PowerShell
Dismount-Volume, NTFS, FS-advisory Unknown caveat
REAL VERIFICATION (paste from agent):
cargo check -p keisei: Finished (clean)
cargo test -p keisei --release: 32 passed 0 failed (30 existing + 2 new)
docker buildx outline: both new Dockerfiles parse
Constructor Pattern:
fs_type.rs 103 LOC, brain.rs 198 LOC (at limit 200, held the line)
All fns <30 LOC. Each USB guide sub-doc 97-115 LOC.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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