refactor(linear): point config at the renamed pearl package

The linear-emacs package was renamed to pearl (~/code/pearl, feature pearl, all symbols pearl-*). Swapped every linear-emacs-* reference to pearl-* across linear-config.el (the use-package form, :load-path, the 26 :commands, the api-key/default-team-id/org-file-path vars, and the lazy-key advice targets pearl--graphql-request-async and pearl-check-setup), the dashboard launcher, and the two test files.

Kept the Linear-domain naming intact, since pearl is just a client for the Linear service: the C-; L prefix, the cj/linear-* wrapper helpers, the "Linear" dashboard label, the api.linear.app authinfo host, and the data/linear.org synced file are unchanged. Verified the wiring in a live daemon — pearl loads, the team id and org-file path apply, and the key advice installs on both entry points.

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