feat(clients): add Pi and OMP support

[christso]

Summary

Adds Pi and OMP as first-class AllAgents clients at project and user scope.

• syncs skills and agent instructions to each client's native project/user paths
• adds real Pi package and OMP marketplace-plugin install, update, uninstall, inspection, and status flows
• generalizes native resource ownership/state handling across Claude, Copilot, Pi, and OMP
• fails closed on project trust, ambiguous ownership, malformed inventories, and unsafe/symlinked destinations
• exposes native effects through human and JSON CLI output

Stack

This is PR 1 of 7 for #460. Later layers add global Pi/OMP profile materialization, per-client profile adapters, and the published profile schemas.

Design decisions

• Native operations use an explicit (client, scope, root, environment) context instead of ambient process state.
• Pi supports npm, Git, and local package sources on Pi 0.85.1–0.85.x. Project installs require trust recorded outside the project boundary.
• OMP supports scoped marketplace plugins on OMP 18.1.17+. Ordinary operations clear inherited profile selectors while preserving HOME/XDG roots.
• Marketplace registrations are retained on uninstall; AllAgents removes only corroborated managed resources.
• Pi MCP adapter support in this layer is inspection-only. Profile materialization arrives later in the stack.

Validation

Automated:

bun run build
bun run typecheck
bun run lint
bun test                     # 1586 passed, 6 skipped
bun run test:e2e             # 142 passed, 4 skipped
bun run docs:build

Real-runtime E2E used the built dist/index.js, Pi 0.85.1, and OMP 18.1.20 in isolated temporary HOME/XDG roots:

1. Synced one plugin skill into project .pi/skills/ and .omp/skills/ paths.
2. Synced the same skill into user ~/.pi/agent/skills/ and ~/.omp/agent/skills/ paths.
3. Launched Pi's real TUI and confirmed /skills discovered dogfood-shared.
4. Installed a local Pi package and compound-engineering@EveryInc/compound-engineering-plugin through AllAgents native mode.
5. Confirmed the resources with real pi list and omp plugin list --json inventories.
6. Ran targeted updates for both resources and observed updated: 1, skipped: 0, plus changed native effects.
7. Uninstalled both resources through AllAgents and confirmed both real client inventories were empty.
8. Confirmed Pi rejects project-controlled trust before mutation.
9. Confirmed a symlinked client destination cannot write outside the project.
10. Confirmed allagents status is read-only and reports managed native ownership without creating marketplace state.

Related: #460

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