feat(bootstrap): set hostname in Phase 0

Rename the machine to the name in the bundle's identity.json (default GURU-5070,
override with -Hostname) when run as admin, with an end-of-run reboot reminder.
Ensures scheduled tasks, coord session IDs, and log attribution line up. RESTORE.md
documents the step.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/bootstrap/RESTORE.md

@@ -57,6 +57,11 @@ Copy-Item F:\claudetools-recovery\bootstrap\windows-bootstrap.ps1 $env:TEMP\boot
 F:\claudetools-recovery\bootstrap\windows-bootstrap.ps1 -SkipModels
 ```
 
+Run it from an **elevated** shell so Phase 0 can rename the machine to `GURU-5070`
+(read from the bundle's identity.json; override with `-Hostname <name>`). The rename
+needs a **reboot** to take effect — the script reminds you at the end. Re-run after the
+reboot to finish any phases that depend on the hostname.
+
 `-SkipModels` defers the ~50 GB Ollama downloads. Drop it (or run Phase 8 later) when
 you want them. Add `-RestoreData` to also pull back the large client data from `F:\...\data`.
 
@@ -67,6 +72,8 @@ just part of it: `-OnlyPhases "1,2,3"`.
 
 ## Manual path (if you'd rather do it by hand)
 
+0. **Set the hostname** (elevated): `Rename-Computer -NewName GURU-5070 -Restart`. Do this
+   first so scheduled tasks / coord session IDs line up after the reboot.
 1. **Install App Installer** (winget) from the Microsoft Store if missing.
 2. **Core tools** (winget ids):
    `Git.Git`, `OpenJS.NodeJS.LTS`, `Python.Python.3.14`, `Rustlang.Rustup`,