audit: remove the fusion pitfall bullet added by #13 #16

port: docs/guide/10-recipes-and-pitfalls.md L175

upstream: pstack/docs/guide/10-recipes-and-pitfalls.md L174–175 at 88d4751 (pstack 0.15.29). There is no Fusion bullet. The auto bullet is followed directly by:

• Reporting success off a green build. ...

port: an extra bullet added by #13:

• Putting a Fusion model in a role. A fusion-* slug names a lead and sidekick pair for the main chat, so pstack rejects it and falls back to the role's default. Pick the lead's or the sidekick's own slug, like claude-opus-5-5-max or swe-2-high.

why devin doesn't require it: the harness rule (drop fusion-* from detected slugs, treat it as a rejected slug) already lives in skills/setup-pstack/SKILL.md step 1 and in the routed skills. This bullet is an extra guide note with no upstream source. I asked for it to be removed in my review of #13, which merged with it still in.

smallest fix: delete line 175.

found by the whole-port audit against upstream 88d4751 (pstack 0.15.29). fix with Closes #16.