Initial commit: deliver-file skill, t3-deliver, sync script

skills/deliver-file/SKILL.md

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+---
+name: deliver-file
+description: >
+  Deliver a file or directory from this host to the user's device over
+  Tailscale SSH. Use when the user wants to download, receive, or get a
+  file, document, archive, report, or folder from the host machine.
+---
+
+# Deliver File
+
+The user's Windows machine pulls files from this host over Tailscale SSH.
+Host address: `vasily@msi.tail0b014a.ts.net` (Tailscale IP 100.67.41.125).
+
+## Steps
+
+1. Resolve the absolute path of the file or directory.
+2. Run `t3-deliver <path>` (on PATH; source: `global-skills/bin/t3-deliver`).
+3. Hand the printed `scp` line to the user verbatim and note that they run
+   it in cmd or PowerShell on Windows.
+
+If `t3-deliver` is missing, print the equivalent command yourself:
+
+```text
+scp vasily@msi.tail0b014a.ts.net:"/absolute/path/to/file" .
+```
+
+Add `-r` for directories.
+
+## Notes
+
+- Do not start HTTP servers or other transfer machinery for deliveries;
+  Tailscale SSH is the established path.
+- For quick text-only needs the T3 client's "Copy contents" on an open
+  file also works.
+- Keep generated deliverables at predictable paths and tell the user the
+  path when done.