feat(security): phase 4.5 hardening - rate limiting, replay protection, mutation guards, audit enrichment

docs(cleanup): finalize main promotion report

Merge pull request #113 from Modularium/dev

docs(cleanup): record main promotion assessment

docs(cleanup): record remote repo cleanup

docs(cleanup): record final legacy verification

chore(cleanup): remove legacy python and outdated artifacts (#112)

hardening(did): misconfiguration guards (#111)

hardening(did): observability hardening (#110)

hardening(did): high security mode (#109)

hardening(did): action scoping refinement (#108)

hardening(did): global rate limiting (#107)

feat(cli): add adminbotctl (#106)

hardening(p2): classify read-only action sensitivity (#105)

hardening(p2): define audit operations procedure (#104)