[codex] Move internal experiment plans under docs-internal (#57262)

* docs: restore internal plan docs under docs-internal

* docs: move internal plans under docs/internal

* docs: restore deleted internal experiment notes

* docs: group internal notes by author

* docs: move Bob internal notes under osolmaz

* docs: move remaining internal notes under osolmaz

* Revert "docs: move remaining internal notes under osolmaz"

* docs: restore experiment architecture note

* docs: normalize osolmaz internal doc authorship

* docs: add identity metadata to internal docs

* docs: document internal development notes

* docs: use Peter in internal docs examples

* docs: move Mariano background task note to internal docs

* Revert "docs: use Peter in internal docs examples"

* docs: use real Peter note in internal docs readme

* docs: rename Mariano background task note

* docs: preserve others internal notes by default

* docs: allow BDFL override for internal notes

scripts/docs-list.js

@@ -20,7 +20,7 @@ if (!statSync(DOCS_DIR).isDirectory()) {
   process.exit(1);
 }
 
-const EXCLUDED_DIRS = new Set(["archive", "research"]);
+const EXCLUDED_DIRS = new Set(["archive", "internal", "research"]);
 
 /**
  * @param {unknown[]} values