windows: add targeted UIA lookup and fix MCP schemas

[voctory]

Summary

Adds a targeted find_element MCP tool for locating UIA elements by query, label, automation id, identifier, control type, and browser/page search zones.

Improves Windows action routing by preferring supported UIA action patterns before MSAA fallback, treating UIA link controls as actionable, and keeping the named-pipe daemon alive when clients disconnect during slow requests.

Makes MCP array schemas declare items and adds schema coverage for OpenAI-compatible tool definitions.

Updates the Windows build helper to honor global.json SDK roll-forward by accepting the SDK that dotnet resolves from the repo root.

Related Issue

Closes #2

Area

• Windows driver
• macOS driver
• MCP tools
• Input routing
• Browser automation
• Capture or screenshots
• Visual agent cursor
• Recording or replay
• Configuration
• Packaging or install
• Documentation
• Tests

Safety Contract

• Mutating actions do not move the user's real cursor.
• Mutating actions do not steal foreground focus.
• Unsafe routes are explicit opt-ins or refusals, not hidden fallbacks.
• Receipts report the actual route and lane.
• Receipts preserve background_safe, cursor_moved, and foreground_changed.
• Browser routes avoid unsafe UIA/provider fallbacks unless explicitly configured.

Validation

• dotnet build trope-cua.sln
• scripts\run-tests.ps1
• cd native/macos/trope-cua && swift build
• cd native/macos/trope-cua && ./scripts/test.sh
• git diff --check
• Installed or restarted the affected daemon for runtime/install changes.
• Added or updated targeted regression coverage.
• Docs-only change; runtime tests are not applicable.

Evidence

scripts\run-tests.ps1: 78 passed in 30.54s after the SDK roll-forward helper fix.

git diff --check: passed.

Risks and Follow-Up

An earlier local full-suite run had one cursor-position mismatch in test_visual_move_cursor_does_not_move_real_cursor; the isolated test passed immediately afterward and subsequent full-suite runs passed. macOS validation was not run locally because this PR changes the Windows driver/MCP/build-script path only; GitHub macOS CI passed on the first PR run.

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[voctory]

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