Fix OMP Ask prompts reporting as working

[onevcat]

Summary

• classify Oh My Pi's interactive Ask chooser as blocked before evaluating its spinner
• add the captured Ask prompt as a screen-heuristic regression test
• document the Ask chooser blocked-state cue

Verification

• xcodebuild test … -only-testing:supacodeTests/ScreenHeuristicsTests (25 passed)
• make build-app
• make check
• isolated debug app: repo-built prowl agents --json reported blocked / blocked while a real OMP Ask chooser was visible

[Copilot]

Pull request overview

This PR adjusts Oh My Pi/Pi screen heuristics so an interactive Ask chooser is classified as blocked (even if a spinner/status line is present), adds a regression test for that captured prompt, and documents the new blocked-state cue.

Changes:

• Prioritize detection of Pi/Oh My Pi “Ask” chooser prompts as .blocked before spinner/working-line checks.
• Add a screen-heuristics regression test fixture for an Ask chooser capture.
• Update agent-detection docs to mention the Ask chooser as a blocked-state signal.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
supacodeTests/ScreenHeuristicsTests.swift	Adds a regression test ensuring an Oh My Pi “Ask” chooser is classified as .blocked.
supacode/Infrastructure/AgentDetection/ScreenHeuristics.swift	Updates Pi detection to detect Ask prompts as blocked before evaluating working/spinner cues.
docs/components/agent-detection.md	Documents the Ask chooser as a blocked-state cue in screen heuristics.

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