Keep prepared search readers warm and verify abrupt indexing recovery

docs/BUILDING.md

@@ -201,10 +201,13 @@ signing/notarization requires Apple tooling and credentials. See the
 
 ### Windows archive for source installations
 
-After staging the CPU worker and media helpers, build an embedded-frontend
+Stage the normal hardware-detecting worker and media helpers, then build an embedded-frontend
 desktop binary and collect its runtime files:
 
 ```powershell
+python tools/embeddinggemma2/build_runtime.py --backend auto --jobs 2
+python tools/embeddinggemma2/stage_runtime.py --backend auto
+python tools/media-runtime/provision.py --stage
 Set-Location apps/desktop
 npm run tauri -- build --no-bundle
 Set-Location ../..
@@ -223,6 +226,10 @@ using CPU and OS capabilities, and
 the verified Vulkan loader DLL and its license; GPU availability is detected at
 runtime, with CPU fallback. The SDK is used only to compile the app.
 All runtime DLLs are listed by size and SHA-256 in `runtime-libraries.json`.
+Packaging also verifies the original pinned decoder ZIP and compares staged
+FFmpeg/FFprobe, notices and manifest against it. Keep that verified archive in
+`.searchi/media-runtime` while preparing the package; changed staged helpers
+or notices are rejected before replacing a previous archive.
 Staging and packaging reject missing or changed listed dependencies before
 replacing output. CPU-only VM smoke tests can also omit optimized modules to
 exercise the packaged baseline; this does not certify older physical hardware.
@@ -250,6 +257,7 @@ need both verified model files. See [semantic bounds and evidence](SEMANTIC.md)
 for current corpus, localization, and performance limitations. Keep signing keys,
 repository tokens, and model credentials outside source control.
 FFmpeg provisioning supports manifest-pinned Windows/Linux x86-64 and ARM64 artifacts;
-only Windows x86-64 has executed here. macOS decoder packaging remains a gate.
+Windows and Linux x86-64 startup and CPU decoding have executed here;
+other architectures and macOS decoder packaging remain gates.
 See [media runtime provenance](../tools/media-runtime/README.md) and
 [measured media limitations](MEDIA-QUALITY.md).