chore(todo): reopen gptel-toggle and buffer-source tasks with follow-up bugs

Two recent DONE tasks turned out to have follow-up issues worth tracking
explicitly instead of leaving them in the closed pile.

The gptel-toggle work (=M-<f9>= rebind) now triggers a make compile
warning that =cj/toggle-gptel= is not known to be defined when
ai-vterm.el loads.  The binding still works in normal startup because
ai-config.el loads later, but the cross-module load-order dependency
should be made explicit via an autoload declaration plus a test that
loads ai-vterm.el without preloading ai-config.el.

The buffer-source extension shipped an Info-mode dispatcher that
copies =info:(manual)Node= rather than the documented org-style
bracket link =[[info:(manual)Node][label]]=.  The output is a valid
org link target but not the labeled form a Notes paste would expect.

Both parent tasks move back to DOING with sub-TODOs that name the
remaining work, the file/test to update, and the commands to re-run.

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