fix(tui): show default exec command workdir

[jinroh]

What does this PR do?

Show the default working directory in exec_command summaries when workdir is omitted.

Example: {"cmd":"pwd"} → ran pwd in .

How to test it

• ./scripts/test.sh
• ./scripts/lint.sh

Checklist

• I have reviewed the contributing guidelines (CONTRIBUTING.md in the repository root).
• I have added tests or explained why they are not needed. The existing multiline rendering test covers this case.
• I have updated the documentation if needed. No documentation change is needed for this display fix.

[datadog-official]

More details

Omitted or empty workdir values now appear as “in .” in command summaries, without changing command execution. The static reviewer completed with no actionable findings.

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