f4e5f94e17a4ded14ca6db1924dca9578d830da5

update .gitignore to modify exclusion pattern for _del files from '**/_del' to '**/*del'
``
copilot-instructions
developent stragegy
if you are ai assistant
- please read
.github/copilot-instructions.md
- please read
.github/memry_bank/notes.md
- always ignore the pattern matching
.ai_ignore
mentioned.
if you are human
- please refer to :
project/002_source/README.md
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