Endpoint telemetry, PC Detail rework and a checked backup/restore path

.github/copilot-instructions.md

@@ -4,6 +4,16 @@ Follow these when suggesting code. They are enforced by a naming/style hook and
 by CI (`.github/workflows/ci.yml`) - suggestions that break them fail the build.
 `CONTRIBUTING.md` is the full authority; this is the short version.
 
+## General Guidelines
+- Finish the in-flight task before starting new workstreams.
+- When asked to "take notes" on a future idea, capture it in the notes file only - do not implement it, and do not expand on it at length in replies.
+- Use a temp file for multi-line git commit messages instead of heredoc syntax: `git commit -F <file>`.
+- Avoid using `powershell.exe -File` for launching scripts, as it fails if the script file is missing or quarantined.
+
+## Installer Logic
+- The endpoint agent installer shipped to endpoints is generated by `_install_script()` in `plugins/endpoints/api/siteagent.py`, NOT `agent/installer/install-shopdbagent.ps1`. Any installer logic change must be made in `siteagent.py`, followed by rolling the containers.
+- The user's workflow: the agent hands over only the built EXEs (`shopdbagent.exe`, `shopdb-endpoint-tray.exe`); the user uploads them via the "Upload New/Legacy Agents" field in the Build Site Agent UI and builds the package with the newest version selected at the top.
+
 ## Naming (LOCKED - the hook rejects violations)
 
 - **DB tables**: lowercase, concatenated, plural. No underscores, no dashes.