Trim spaces from start grammar

[g-eoj]

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[greptile-apps]

Greptile Summary

This PR cleans up the grammar generation by trimming trailing spaces from the start definition. The build_grammar function previously appended strings with trailing spaces throughout its construction loop, leaving an unwanted trailing space at the end of start_def. The fix applies .strip() on line 157 to remove this trailing whitespace before joining the grammar components.

Key Changes:

• Applied .strip() to start_def in build_grammar function to remove trailing space
• Updated test anchor strings to not include trailing spaces (consistent with cleaner output)
• Refreshed snapshot assertions to reflect the new multi-line format

This is a clean formatting improvement with no functional changes to the grammar semantics.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change is a simple formatting improvement that removes trailing whitespace from generated grammars. All tests have been updated to match the new format, and the change doesn't affect grammar semantics or functionality.
• No files require special attention

Important Files Changed

Filename	Overview
cragents/_utils.py	Adds .strip() to remove trailing space from grammar start definition, improving grammar format consistency
tests/test_agent.py	Removes trailing spaces from test anchor strings to align with cleaner grammar output
tests/test_grammar.py	Updates snapshot assertions to reflect multi-line format and cleaner start grammar without trailing space

_{Last reviewed commit: d762503}