shard(tick): 2026-05-16T12:21Z — multi-Otto contamination caught at tick start#3872
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…ick start HEAD had silently moved to peer's branch (otto-cli-b0037.2-audit-2026-05-16-1131z) between this 12:21Z tick and the prior 12:11Z tick. B-0519 same-session empirical anchor. Caught via `git branch --show-current` at tick start; no commits on peer's branch; switched off via `git switch -c` (no worktree-add — Lior active). Extreme cost-aware tier (GraphQL 788). Shard-only tick. Co-Authored-By: Claude <noreply@anthropic.com>
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Pull request overview
Adds a hygiene-history tick shard documenting a 2026-05-16 Otto-CLI tick where shared-worktree branch contamination was detected and linked to B-0519.
Changes:
- Records the observed HEAD drift to a peer branch at tick start.
- Captures the cost-aware operating tier and defensive workflow choices.
- Preserves visibility/status notes for the ongoing PR and sentinel state.
| ## Multi-Otto contamination observed | ||
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| Between the 12:11Z tick (which ended with HEAD on | ||
| `otto-cli-b0206-audit-2026-05-16-1207z` after PR #3871 land) |
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Deferred-PR landing under
refresh-world-model-poll-pr-gate.mdpure-git tier discipline: branch was pushed at tick 12:21Z when GraphQL ≈788 (extreme cost-aware), PR creation deferred to post-reset. Reset fired 12:55Z; backlog now clearing.Shard
docs/hygiene-history/ticks/2026/05/16/1221Z.md— 1st multi-Otto contamination observation of this session (HEAD silently moved fromotto-cli-b0206-audit-2026-05-16-1207ztootto-cli-b0037.2-audit-2026-05-16-1131zbetween ticks). B-0519 empirical anchor.Discipline applied
git branch --show-currentat tick startgit switch -c <fresh> origin/main(no worktree-add — Lior active)ls-treecanary 53/53 healthy