pstack: link the oh-my-pi community port

[negoro26]

Adds one paragraph under make it yours pointing at a community port of pstack for oh-my-pi: negoro26/pstack-omp.

The README already says "fork it. improve it. make it yours." This gives readers on a different harness a place to go.

What the port is: all 45 skills, 23 playbooks, and both agents at 7314f72, with cursor mechanics swapped for omp equivalents (cloud agents to isolated subagents, /loop to a supervised watcher, transcript paths, and so on) and every vendor model slug replaced with a capability name the operator binds once. It ships as an omp marketplace and installs with two commands. Nothing in this PR changes pstack itself.

Happy to move the line elsewhere or drop it if you'd rather not link out.

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Note

Low Risk
README-only outbound links; no code, config, or data-handling behavior changes.

Overview
Adds a short note in make it yours that pstack stays Cursor-first while the skill prose is largely portable, and points readers to the community oh-my-pi marketplace port negoro26/pstack-omp.

The new paragraph explains that install is via an omp marketplace and that the port replaces Cursor-specific mechanics with omp equivalents and capability-based model naming instead of vendor slugs. No runtime, skill, or automation files change—only pstack/README.md.

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