- BUILD.md: an R5 section covering N1 to N3, the fixes, the tests, the
RED and GREEN counts, the 57-mutant table, the 13-shape live probe,
the false BUSY and miss checks, and the known limits after R5. N3
corrects the R4 bind-mount note: a same-filesystem bind mount keeps
st_dev, so a detector needs mount metadata such as
/proc/self/mountinfo. No code changed for N3. Earlier sections are
untouched.
- docs/TOOLS.md: the busy check's flat form, span rule, exit 2 on text
it can't classify, the literal listing, and 153 cases.
- BUILD-LOG.md and docs/SESSIONS.md: one appended entry each.