The monolithic docs/memory-system/03-architecture-decisions.md had
grown to 27 entries and was becoming hard to navigate and diff. Run
/os-adr:migrate to split it into docs/adr/ (one file per ADR plus a
generated README index and migration report), promoting the cc-os
retrofit ahead of pilot projects per the ADR-020 amendment recorded
in the monolith.
The monolith is retained as the historical source (tagged with
migration_source frontmatter) but new decisions now go in docs/adr/.
Update CLAUDE.md's layout and conventions sections and
docs/implementation-status.md's timeline/rollout notes to point at
the new location.
Closes out the /os-status:fix run; refs ADR-020.
jared