docs(claude): record five session insights in CLAUDE.md

Captures five durable findings worth carrying forward:

- :config blocks need a full Emacs launch smoke test.  nerd-icons (:defer change) and flycheck (eval in :command) both passed unit tests but broke at launch.
- gptel-model must be a symbol.  The modeline render calls symbolp and OpenAI's renderer is strict where Anthropic's tolerated strings.
- flycheck-define-checker rejects (eval ...) in the :command executable slot.  Wrap the whole macro in eval+backquote to splice a computed path.
- Emacs 30 batch mode: provide doesn't fire eval-after-load callbacks.  Only load does, so tests should assert against after-load-alist directly.
- Warn at module load when an external tool path is configured but missing (cj/executable-find-or-warn) instead of letting the first call fail mid-edit.

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