# R5 investigation baseline

- Worktree: `/Users/vonng/.codex/worktrees/77ad/silo`
- HEAD: `9ebe81c1b3611f9cc73e676b5b741c2be62c467a`; GitHub main checked live on 2026-09-15.
- Branch: `codex/r5-tag-deletion-ordering`.
- WORKFLOW: `/Users/vonng/tmp/silo-r4-r8-20260915-01a0a5ab/WORKFLOW.md` read completely.
- This isolated worktree has no AGENTS.md. Read `/Users/vonng/pgsty/silo/AGENTS.md`: PGSTY supported stack, minimal compatible changes, separate local/merge/release gates.
- Existing tag storage reconciliation is already in HEAD; inspect and reuse it.
- No open R5 PR in live `gh pr list`; unrelated open PRs #184 and #187 belong to R6/R7.
- Parent reproduction: `/Users/vonng/tmp/silo-r4-r8-20260915-01a0a5ab/baseline-evidence/r5-handler.log`.
- Current reproduction overlay and raw output: `/Users/vonng/tmp/silo-r5-20260915-77ad/`.
- Claude Code actual version: 2.1.270 at `/opt/homebrew/bin/claude`. Required model `claude-opus-5`, effort `max`; model identity must be checked in assistant messages.
- Toolchain: go1.27.1 darwin/arm64. Targeted tests use GOMAXPROCS=2 and -p 1 to share the host.

## Ownership

R4 owns `cmd/object-api-options.go` KMS common-field preservation and option tests. R5 does not edit that file. R5 owns tag state generation, wire propagation, COPY/PUT/multipart persistence and ordered replay tests. Coordination requested through parent while R4 actual task ID is pending.