Trim Build macOS plugin prompts

[dimillian-oai]

Summary

• normalize the Build macOS Apps plugin starter prompt to the current plugin prompt-array contract
• shorten the plugin-level prompt and all macOS skill trigger descriptions so discovery metadata stays compact
• defer detailed sidebar/split-view and window modifier examples into references while keeping skill entrypoints focused

Why

build-macos-apps could not be scored by plugin-eval while its manifest starter prompt was still a string. After that prompt shape was normalized, the static report showed both trigger and invocation budget failures driven by long skill trigger metadata and detailed examples in always-loaded SKILL.md entrypoints.

This PR keeps the same macOS skill inventory and routing terms, but moves detailed examples out of the entrypoint path where they can be loaded only when the task needs them.

Impact

Build macOS Apps keeps its existing workflows while its starter prompt metadata matches the current plugin contract, trigger descriptions are smaller, and high-detail SwiftUI/window examples live in references instead of always-loaded skill bodies.

plugin-eval report progression

The same local report command was used throughout:

cd plugins/plugin-eval
node ./scripts/plugin-eval.js analyze ../build-macos-apps --format markdown

Before the manifest prompt was normalized, plugin-eval could not emit a scored report because the string-shaped defaultPrompt hit:

((intermediate value) || []).join is not a function

State	Score	Risk	Checks	Trigger	Invoke	Deferred	Active	Total
First scored report after starter-prompt shape normalization	67 / D	high	2 fail, 1 warn, 2 info	899	15529	7722	16428	24150
After compacting all Build macOS skill descriptions	77 / C	high	1 fail, 2 warn, 2 info	464	15092	7722	15556	23278
Final after deferring sidebar/split and window API examples	86 / B	medium	0 fail, 3 warn, 2 info	464	14291	8507	14755	23262

The final report clears the trigger and invocation budget failures. Remaining warnings are static budget warnings for trigger, invoke, and deferred text.

Validation

• node ./scripts/plugin-eval.js analyze ../build-macos-apps --format markdown
• git diff --check