chore(gitignore): ignore local coverage report outputs

[karagozemin]

Problem

Local Node coverage runs can leave standard coverage directories and LCOV files untracked because the repository ignore rules do not cover them.

Task

Ignore local coverage output while keeping committed fixtures and configuration visible.

Acceptance criteria

• Standard coverage directories and LCOV report files are ignored.
• No existing tracked file becomes unintentionally hidden.
• Only ignore rules change.

Suggested implementation prompt

Add narrowly scoped ignore patterns for local coverage directories and LCOV reports, verify existing tracked files are unaffected, and keep the diff to the ignore file.

[emrekayat]

can ı work on it?

[grantfox-oss]

🦊 GrantFox — @emrekayat has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #253)
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