docs: plan P2-1 done + P3 progress (udev-shim, dep warnings, quirks drift)

local/docs/DRIVER-MANAGER-MIGRATION-PLAN.md

@@ -73,11 +73,13 @@ cache now tracks Cargo `path =` dependency source trees**
 is closed and verified (`DEBUG: cargo path-dep source hashes changed`
 → rebuild → cached).
 
-Open items (updated): **P2-1** pcid AER/pciehp producers, **P3**
-policy/hygiene (quirk phases, AER recovery actions, per-vendor
-firmware packaging, udev-shim driver-binding view, quirks TOML/parser
-flag drift — `/etc/quirks.d/15-audio.toml` uses flags the parser does
-not know, dep-crate warnings, `acpid pci_fd is not registered` error).
+Open items (updated): **P3-remaining** — lifecycle phases on quirk
+entries (`phase = "early"|"enable"`), AER recovery actions wired to
+drivers (`pci_ers_result` mapping), per-vendor firmware packaging,
+concurrent path's double bus enumeration, `acpid pci_fd is not
+registered`. Resolved: P2-1 done (pcid AER + pciehp producers live and
+validated); dep-crate warnings fixed; udev-shim driver-binding view
+wired; quirks TOML/parser flag drift resolved (open domain channel).
 
 **v3.1 status update over v3.0 (implementation + cutover round, 2026-07-23):**