Vendor the 43 ce-* persona definitions (from compound-engineering 3.9.4),
add installBundledCeAgents() mirroring the skill installer (pinned,
plugin-local, idempotent, never a global ~/.claude/agents), install them
in onLoad, and expose the install dir to executor/step sessions via an
executorRuntimeEnv hook (FUSION_CE_AGENTS_DIR).
Together with U2's systemPromptOverride this gives the lightweight
subagent path: a CE skill reads a persona def from FUSION_CE_AGENTS_DIR
and passes its body to fn_spawn_agent. Installer test added (19 plugin
tests green).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Bundle pinned copies of 7 CE pipeline-stage skills (strategy, ideate,
brainstorm, plan, work, code-review, compound) under src/skills/ and declare
them via PluginSkillContribution. Empirical finding: the skills contribution
alone does not make a SKILL.md resolvable in a session -- the engine ingests it
as a name only. So onLoad runs an idempotent, isolation-guarded physical install
into a plugin-local .fusion-ce-skills/ dir (never a global ~/.claude/skills),
which the engine skill-resolver can then discover. Proven against the real
loadSkills + resolveSessionSkills pipeline.
