Fleet behaves more like Fable 5 on existing model tiers, behind
ROBOCO_FABLE_MODE_ENABLED (config default off; armed :-true on the NAS compose,
absent from the registry compose).
- Doctrine: vendored agents/prompts/doctrine/fable.md composed into every
agent's system prompt via fable_doctrine_layer() after base.md.
- Hooks (Claude Code): 4 non-overlapping hooks (stop-gate/bash-discipline/
honesty-nudge/precompact) appended per-agent via _fable_hook_groups(). The
make-quality + lint-suppression duplicates are deliberately NOT added (already
gate-enforced); session-start skipped.
- Hooks (grok): conservative V1 — only the non-denying honesty-nudge, since a
grok hook deny cancels the whole run.
- Flag on the feature-flags card; hook scripts shipped into the agent image.
Flag-off spawn path proven byte-identical (worktree diff, sha256 match); full
suite green (2074 unit + e2e-smoke + hook harness), mypy/xenon/ruff clean.
Fixed a real stdin bug in the vendored stop-gate hook (heredoc + pipe both
claimed stdin). Distilled from rennf93/opus-fable-playbook (MIT).
