docs: D.1b narrowed + drill B2/B3 marked FIXED (agent v0.63.0)

Restart-the-agent step in day0-install.md is now conditional on agent <
v0.63.0 (reload-on-miss shipped; Day-0 manifest still vouches 0.62.0).
Troubleshooting row + drill ledger + go/no-go item 8 updated.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6

scripts/CHANGELOG.md

@@ -1,5 +1,14 @@
 # Felhom scripts — Changelog
 
+## docs — day0-install D.1b narrowed + drill ledger B2/B3 → FIXED agent v0.63.0 (2026-07-03)
+
+Agent v0.63.0 fixed both drill findings (B3 token reload-on-miss + B2 guesthook snippets-dir
+mkdir; red-proofed, deployed on felhom-pve, Gitea-published sha256 b4a89c81…). Guide follow-through:
+the D.1b "restart the agent first" step is now CONDITIONAL (only for an installed agent < v0.63.0 —
+the Day-0 manifest still vouches 0.62.0, so today's fresh installs still hit it); the 401
+troubleshooting row records the fix version; the drill ledger + go/no-go item 8 marked FIXED.
+Operator follow-up unchanged: vouch agent 0.63.0 in the Day-0 manifest UI, then the step is dead.
+
 ## felhom-host-install.sh v1.9.1 — clean-room drill fixes: residue-free uninstall + post-provision reboot (2026-07-03)
 
 Companion to the Day-0 go-live package (`documentation/runbooks/day0-install.md` +