Fix release smoke test and TG pin

[tig]

Summary

Fixes the release blockers seen in the v1.0.0-rc.5 release run:

• update the oversized --initial smoke test to expect Terminal.Gui.Cli's usage-error exit code 2
• bump the default Terminal.Gui pin to 2.4.2, matching the latest stable release required by the freshness gate

Validation

• dotnet build Clet.slnx -c Release
• dotnet run --project tests/Clet.SmokeTests --no-build -c Release

Release failures addressed:

• stale TerminalGuiVersion 2.4.1 rejected by release freshness gate
• Linux/macOS release smoke tests expected exit code 65 but actual was 2

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore validation exit-code assertion

On Linux/macOS this smoke test is the process-level guard for the documented oversized --initial contract: specs/clet-spec.md says known aliases that exceed the 64 KiB cap must exit 65 with input-too-large. Changing the assertion to 2 lets the release workflow pass while shipping the currently observed usage-error exit code, so callers that distinguish validation failures from usage errors will see the wrong status; either keep the test at 65 and fix the mapping, or update the spec/docs if the contract is intentionally changing.

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