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* fix: detect virtiofsd at off-PATH install locations (#447) Ubuntu ships virtiofsd at /usr/libexec/virtiofsd (from qemu-system-common) and Arch/CachyOS/Manjaro at /usr/lib/virtiofsd. Neither is on the default $PATH, so doctor.sh's `command -v virtiofsd` always returned a false negative — users would install the package and still see "virtiofsd: not found" (reported most recently by @zabka in #445, originally flagged by @jarrodcolburn). Adds a _find_virtiofsd helper that searches PATH first, then the known off-PATH install locations: - /usr/libexec/virtiofsd (Debian/Ubuntu/Fedora/RHEL) - /usr/lib/qemu/virtiofsd (legacy Debian) - /usr/lib/virtiofsd (Arch/CachyOS/Manjaro) Splits virtiofsd out of the KVM tools loop into a dedicated three-branch check: [PASS] virtiofsd: found — on PATH [PASS] virtiofsd: found at <path> (not on PATH) — off-PATH, bwrap default (virtiofsd unused) [WARN] virtiofsd: found at <path> but not on PATH — off-PATH, COWORK_VM_BACKEND=kvm (+ info lines about 9p fallback + symlink Fix) [INFO]/[WARN] virtiofsd: not found — missing (severity ladder unchanged) The WARN-on-KVM-active branch surfaces that KvmBackend spawns virtiofsd by PATH name and will silently fall back to virtio-9p (lower performance) if the binary is only reachable off-PATH — so the user knows a symlink is needed to actually get virtiofs performance. Tests: 6 new BATS cases in tests/cowork-bwrap-config.bats exercise the helper (PATH hit / fallback hit / ordered fallback / total miss / non-executable skip / default-list regression guard for the Arch path). All 45 tests pass. Does not touch cowork-vm-service.js — teaching KvmBackend to probe these same paths would give Ubuntu KVM users real virtiofs performance without a symlink, but that's a separate change. Fixes #447 Co-Authored-By: Claude <claude@anthropic.com> * style: collapse unnecessary line continuations in virtiofsd check Simplifier pass — the five backslash-continued `_warn` / `_info` invocations in the new virtiofsd three-severity block were all under 63 chars after collapsing, well within the project's 80-char guideline. The continuations were visual noise, not wrap-driven. Behavior byte-identical. All 45 BATS tests still pass. Co-Authored-By: Claude <claude@anthropic.com> --------- Co-authored-by: Claude <claude@anthropic.com>