Fix Pi compatibility gaps (module installer, config, drift detector)

[striderZA]

Three critical gaps break the Pi harness experience:

1. Module installer not Pi-aware: .opencode/modules/install.mjs only copies to .opencode/ paths. Pi reads from .agents/ directly via ocgs-core extension. Pi users get nothing from module installation.

2. pi.json phantom reference: README.md and AGENTS.md reference pi.json as Pi's config file. This file doesn't exist. Actual Pi config is .pi/settings.json.

3. ocgs-drift-detector REQUIRED_SECTIONS bug: Checks agents for ["name", "description"] by searching for **name**, ## name markdown patterns. But agent files have these as YAML frontmatter fields (name: creative-director), NOT markdown headings. Produces false positives on every agent file.

Tasks

• Add --pi flag to install.mjs that targets .agents/ instead of .opencode/, or make .agents/ the default target
• Either create pi.json with appropriate content or remove all references to it in README.md and AGENTS.md
• Fix ocgs-drift-detector REQUIRED_SECTIONS to parse YAML frontmatter instead of searching for markdown headings
• Fix installed.json location mismatch (canonical at .agents/modules/ but script writes to .opencode/modules/)

Affected Files

• .opencode/modules/install.mjs
• README.md
• AGENTS.md
• .pi/extensions/ocgs-drift-detector/index.ts

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Identified during comprehensive framework review on 2026-07-21