fix(pstack): kebab-case agent slugs with no spaces

[joshrichards37]

Why

Spawn types must be kebab-case slugs that exist on this session's spawn tool. A space in the agent name makes lookup fail on some harnesses even when the type is listed.

The comments agent is comment-sicko. Use the type this session's spawn tool lists, including a plugin prefix when the enum has one.

Scope

• Rename agent name to comment-sicko
• Add poteto-mode/references/harness.md for slugs and lookup fallback
• Point spawn call sites at that file

Verification

Spawned comment-sicko after the rename. Lookup succeeded.

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Note

Low Risk
Documentation and skill routing only; no runtime code paths, but it changes how agents spawn across all pstack workflows.

Overview
Fixes subagent spawn lookup by standardizing agent names as kebab-case slugs (notably comment-sicko instead of a spaced display name) and documenting how every skill should spawn agents.

Adds poteto-mode/references/harness.md as the single source for type slugs (poteto-agent, comment-sicko, generic/explore/plan), plugin-prefix retry, poteto-with-markdown fallback, and model slug rules. README, poteto-mode, no-comments, and parallel workflow skills (how, why, interrogate, reflect, swarm, setup-pstack, opening-a-pr) now point at that file and use “this session’s spawn tool” wording instead of hardcoded Task / generalPurpose / quoted type strings.

/no-comments spawns via the harness slug (with fallback); interrogate drops reviewer defaults whose model slug the session does not list.

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