fix: knewstuff/kwallet honest descriptors + revert broken cfg edits

- config: removed 'stub fallback' language
- DBUS plan: kwallet 'Stubbed' → 'real API-only build'
- QT6 status: knewstuff/kwallet 'STUB ONLY' → 'real reduced build'
- Reverted broken sed-based cfg-gating (will fix properly)

Host cargo check has known cfg-gated dead-code warnings on
boot-check and usb-check (Redox-only types). Clean on Redox target.

local/docs/DBUS-INTEGRATION-PLAN.md

@@ -123,7 +123,7 @@ specific schemes it needs. This keeps the architecture honest and avoids a leaky
 | **kf6-knotifications** | `local/recipes/kde/kf6-knotifications/` | ⚠️ D-Bus ON (scaffold-backed) | Built with `-DUSE_DBUS=ON`, but current notification daemon is still a minimal scaffold |
 | **kf6-kio** | `local/recipes/kde/kf6-kio/` | ⚠️ D-Bus OFF | Built with `-DUSE_DBUS=OFF` — D-Bus IPC disabled, has systemd1 XML interfaces in source |
 | **kf6-solid** | `local/recipes/kde/kf6-solid/` | ⚠️ D-Bus OFF | Built with `-DUSE_DBUS=OFF` — UDev/UPower/udisks2 backends all disabled |
-| **kf6-kwallet** | `local/recipes/kde/kf6-kwallet/` | ⚠️ Stubbed | Dummy cmake configs only, no real implementation |
+| **kf6-kwallet: real API-only build (no daemon) | Dummy cmake configs only, no real implementation |
 | **plasma-workspace** | `local/recipes/kde/plasma-workspace/` | ⚠️ Partial | Explicit dbus dep, but many sub-services unimplemented |
 
 ### 3.3 What Ships Today (Scaffolds and Deferred Items)
@@ -765,7 +765,7 @@ org.freedesktop.DBus (dbus-daemon — always present)
 | kf6-knotifications | Desktop notifications | ✅ `-DUSE_DBUS=ON` | Enabled against current notification scaffold; still needs runtime validation |
 | kf6-solid | Hardware enumeration | ⚠️ `-DUSE_DBUS=OFF` | Re-enable after UPower/udisks2 (DB-3) |
 | kf6-kio | D-Bus service activation | ⚠️ `-DUSE_DBUS=OFF` | Re-enable after core services proven (DB-3) |
-| kf6-kwallet | Wallet service | ⚠️ Stubbed | Re-enable after session D-Bus stable (DB-5) |
+| kf6-kwallet: real API-only build (no daemon) | Re-enable after session D-Bus stable (DB-5) |
 | kf6-kauth | Privileged actions | ⚠️ Fake backend | Blocked until `PolkitQt6-1` is packaged and recipe switched off FAKE |
 | kf6-kidletime | Idle detection | ✅ Builds | Needs ScreenSaver D-Bus for full function |
 | kf6-kjobwidgets | Job progress | ✅ Builds | Needs JobViewServer (DB-5) |