Replace the stdout extraction idiom with an EXTRACT command

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR replaces the multi-step stdout extraction idiom in CLI tests with a dedicated DSL command.

Changes:

• Introduces EXTRACT STDOUT FROM <observation> INTO <destination> in scripts/clitest.py.
• Removes the obsolete KEEP LINES MATCHING command from the interpreter and DSL reference.
• Extracts only 1>-prefixed observation records and restores their original content lines.
• Registers extracted files as produced artifacts and observations as consumed inputs in the static test checker.
• Migrates bundle, compile, validate, and JSON test-report fixtures to the new command.

Technical Notes: Observation files encode stdout as 1> records and bare 1> records for empty lines; the new command handles both forms and writes normalized LF-terminated output.

_{🤖 Was this summary useful? React with 👍 or 👎}

[augmentcode]

Review completed. No suggestions at this time.

Comment augment review to trigger a new review at any time.