feat(addons): let a manifest declare the context files the host loads

An add-on that keeps small notes for the person can now name the index
files that the host puts in the prompt of a chat. The declaration is
capabilities.contextFiles: at most one file for each scope (user, agent,
channel), each a path under Memory/ that ends in .md, with an optional
byte cap that can only lower the host's 2 KiB cap.

The field is new, so a manifest that uses it must accept manifest API 2.
The add-on only names paths. The host reads them as the person, so the
declaration gives the add-on no access to files.

Assisted-by: Claude:claude-sonnet-5-5
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

scripts/addons/suites.json

@@ -414,6 +414,12 @@
           "needs the egress check among the host operations",
           "refuses an unknown kind, a bad title and a bad or repeated preset",
           "reads capabilities.network from JSON and refuses an unknown field in it",
+          "is valid with one file for each scope",
+          "needs a manifest that accepts API 2 to declare context files",
+          "refuses a path outside the Memory folder, an unsafe path and a wrong placeholder",
+          "refuses a cap that is negative or above the host's index cap",
+          "refuses two files for one scope and more files than scopes",
+          "reads capabilities.contextFiles from JSON and refuses an unknown field in it",
           "is drawn for a declared capability that holds the grant, with no bash tool",
           "is not drawn for a declared capability without the grant",
           "is drawn for a manifest that declares no network and replaces bash, as before",