Disconnect collapse: predecessor bookend landed; netem-tc install VERIFIED (step E unblocked) ...

- docs/audit/netem-sudo-install-20260721.txt: read-only verification of the
  operator-run install (0440 root:root, byte-identical, sudo -n -l exit 0)
- CURRENT-STATE step-E paragraph: install PENDING -> INSTALLED+VERIFIED,
  remaining path stated (GA-R1 C1/C2, same commit)
- session-ledger: bounded SESSION CLOSE for the close-and-delivery session
- changelog-20260721-netem-install-verify.md: session changelog w/ reverts;
  ledger-scan D-131 status-phrasing blind spot flagged as queued finding

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013XRtm5sDQgUsZyTJk3k7dz