fix(runtime): match run env against effective overlay

[roodboi]

Summary

• compare live runtime env against the effective overlay Hack selected for hack run
• keep --no-deps enabled when omitted --env resolves to the same default overlay already running
• add a regression test for default-overlay run behavior

Verification

• bun test tests/project-run-command.test.ts
• bun run typecheck
• bun x ultracite check src/commands/project.ts tests/project-run-command.test.ts

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