Add fable-mode (Companion & Personality)#326
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Adds fable-mode to Companion & Personality.
fable-mode is a Claude Code plugin that makes Opus 4.8 behave like Claude Fable 5. It combines a doctrine output style (transcribed by Fable 5 itself), seven fail-open hooks that catch behavioral drift at the harness level (blocking promise-only turn endings, denying shell file-reads in favor of Read/Grep, nudging verbatim failure reporting), three skills, and a critic agent. Convergence is measured, not claimed: a 12-probe eval loop judges it pairwise against golden Fable 5 transcripts, and both eval reports (including the dimensions where it loses) are committed in the repo.
Checklist per your contributing notes: real use case (running Opus sessions under Fable's behavioral contract); no duplicate of an existing entry (closest neighbor is claude-familiar, which does companion personality — fable-mode does model-behavior doctrine with enforcement and evals); tested — 64-case suite, CI on ubuntu and macos, released v0.1.2. Install:
/plugin marketplace add rennf93/opus-fable-playbook.