Clarify that pre and post download are out of scope

Author: Trenly

.github/instructions/specs.instructions.md

@@ -40,7 +40,7 @@ issue id: <github issue id>
 ---
 ```
 
-Update `last updated` whenever the spec is modified.
+Update `last updated` to the current date (format: `yyyy-mm-dd`) whenever the spec is modified. Do not append notes or descriptions — the value must be a plain date only.
 
 ## Required Sections
 

doc/specs/#3483 - UserMessages.md

@@ -545,6 +545,7 @@ The timeline for each phase is driven by client adoption telemetry, not fixed da
 The `UserMessages` object is designed to be extended. Potential future additions include:
 
 - **`PostReboot`** — Message displayed after a reboot triggered by the package.
+- **`PreDownload` / `PostDownload` ** — Message displayed before the package is downloaded, if different from pre-install. Also applies to `winget download`
 - **`Configuration`** — Message displayed when the package is processed as part of a WinGet Configuration.
 - **Structured message types** — Replacing plain strings with objects that include severity, category, or formatting hints.
 - **Aggregate pre-message summary** — For bulk operations, presenting all pre-messages in a single summary before beginning the batch.