Hold resumed turns and public-link visitors to the right wiki rules

A paused turn is found by the agent owner's id, so anyone holding one of
the owner's agent keys could resume the owner's own chat with its saved
wiki edit rights. A resume now counts as an API or widget caller when
either the saved state or the resuming request is one, cuts the wiki tool
to wiki_view unless the wiki allows outside edits, and gives the tool
executor the same flags. A request that names an agent, by key or id, may
only resume that agent's turn; otherwise the claim is released and the
request refused.

Public-link visitors run as themselves and reach only wikis they may edit,
so the wiki switch no longer applies to them. Instead every wiki write in
a public-link run waits for the visitor's approval, so the agent owner's
prompt or sources can't steer an edit to the visitor's wiki unasked.

docsgpt/storage/db/models.py

@@ -381,7 +381,7 @@ sources_table = Table(
     ),
     # Whose account a shared resource runs with: the owner's, or each member's.
     Column("credential_mode", Text, nullable=False, server_default="owner"),
-    # A wiki's owner lets API, widget and public-link runs edit it (off: read only).
+    # A wiki's owner lets API-key and widget runs edit it (off: read only).
     Column("wiki_outside_edits", Boolean, nullable=False, server_default="false"),
 )