docs(ROADMAP): persist install logs to USB by default (debug mode)

Add to v0.7 scope: bootstrap ISO writes /var/log/anaconda + the
resolved ks + ostreecontainer pull log + dmesg back to the USB stick
into veilor-install-logs/<timestamp>/. Toggleable via kernel cmdline
inst.veilor.savelogs=0 for opt-out. ON by default through v0.7-v0.9;
flips OFF for v1.0 final release.

Why: failed install + bricked machine + no screenshots — operator boots
back to a working OS, plugs the USB, reads logs offline. No more
"please take a photo of dracut".

docs/ROADMAP.md

@@ -264,6 +264,21 @@ Scope:
 - `veilor-update` rewritten on `bootc upgrade` (was `dnf upgrade`)
 - Forgejo registry as primary OCI publish target; GHCR mirror optional
 - cosign key-pair signing of OCI image (replaces broken keyless flow)
+- **Installer logs persisted to USB stick by default** (debug mode):
+  the bootstrap ISO writes `/var/log/anaconda/*` + the resolved
+  kickstart + ostreecontainer pull log + dmesg back onto the USB
+  install medium (mounted rw at `/run/install/repo` during install)
+  into a `veilor-install-logs/<timestamp>/` folder. Toggleable via
+  kernel cmdline `inst.veilor.savelogs=0` for opt-out, or
+  `inst.veilor.savelogs=1` (default). Stays **ON by default through
+  v0.7+v0.8+v0.9; flips OFF for v1.0 final release**. Why: any failed
+  install, the operator boots back to a working OS, plugs the USB,
+  reads the logs offline — no need to take screenshots of dracut on a
+  bricked machine. Implementation: `%post --nochroot` block in
+  `kickstart/install-ostreecontainer.ks` that detects the install
+  medium via `/run/install/repo` rw remount, copies the log set,
+  syncs, then unmounts. If the medium is read-only (DVD), skip
+  silently with a `journalctl` warning.
 
 Public-flex items kept from original v0.7 entry: