docs: add implementation plans for specs 0a and 0b

- 2026-07-24-shared-module.md: 8 tasks, extract the shared Go module
- 2026-07-24-instance-rename.md: 9 tasks, Org -> Instance including the
  database field, with migration 0004 and a rollback command

No automated tests per instruction; verification is by compiler, grep, and
manual end-to-end plus production-snapshot rehearsal. Spec testing sections
updated to match.
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2026-07-24 13:31:14 +01:00
parent b027ad3f7f
commit bdc26e4799
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