fix(cli): scope test discovery to package

[akonwi]

Summary

• stop ard test <directory> traversal at nested ard.toml package boundaries
• keep the explicitly requested package root searchable
• add a regression test covering a root test alongside a nested example project

Problem

Running ard test . in dram traversed into examples/hello, which has its own ard.toml. The CLI attempted to load that example as part of the root package and failed before discovering test/dram_test.ard.

Validation

• cd compiler && go test . -run 'TestDiscoverTestFilesSkipsNestedProjects|TestTestCommand' -count=1
• cd compiler && go test ./... -count=1
• built the branch compiler and ran ard test . in ../dram: 27 passed, 0 failed, 0 panicked
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
ard-lang-dev	Ready	Preview, Comment	Jul 21, 2026 1:40am