feat(docs-files-api): README sells and gets to TADA; CONTRIBUTING has the rest

AGENTS.md is a symlink to CONTRIBUTING.md.

Generated-by: Claude Opus 5.5

README.md

@@ -22,8 +22,9 @@ Code](https://code.claude.com/docs/en/skills) and
   failure path leaves a trace in the logs.
 - [lazy-tdd](lazy-tdd/SKILL.md) — works the first time? fine. Goofed?
   You owe a test.
-- [docs-files-api](docs-files-api/SKILL.md) — exported API docs over
-  file docs. Avoid chit-chat.
+- [docs-files-api](docs-files-api/SKILL.md) — README sells and gets
+  you to TADA; CONTRIBUTING has the rest; AGENTS.md links to it.
+  Exported API docs over file docs. Avoid chit-chat.
 
 ## commits and PRs