fix(cli): add compact exec alias

[OnlyYu1996]

Summary

• add exec as a visible alias for cortex compact run
• cover the alias with a clap parsing regression test
• fix the stale
  ead_file_with_encoding test import so the focused CLI test target builds cleanly

Bounty issue: PlatformNetwork/bounty-challenge#53075

Validation

• cargo +stable fmt --package cortex-cli --check
• cargo +stable test --package cortex-cli compact_cmd::tests::test_compact_run_exec_alias -- --nocapture
• cargo +stable check --package cortex-cli --lib
• cargo +stable build --package cortex-cli --bin Cortex
• git diff --check
• arget/debug/Cortex.exe --color never compact --help shows
  un ... [aliases: exec]
• arget/debug/Cortex.exe --color never compact exec --dry-run reaches dry-run output

[greptile-apps]

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