Regenerate nine canonical modules using scripts/update_lib at CPython
3.15.0 d220409a13b77de7a6c30abe16ea90db01528edc. Keep the discovery
package split out until its missing test family is available.
AI-assisted source selection, synchronization, review and bounded
validation using OpenAI Codex. No native capability claims are added.
Assisted-by: Codex:unknown
