feat(secrets): age-encrypt fish secrets; purge plaintext from history

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dot_config/fish/conf.d/encrypted_secrets.fish.age

@@ -0,0 +1,28 @@
+-----BEGIN AGE ENCRYPTED FILE-----
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+PCCl0pB2c3e2oP6o9U2R5aPhLLtmkGY1alJ00PHQecw=
+-----END AGE ENCRYPTED FILE-----