cleanup: remove/gitignore mock-agent binary

[Cali0707]

In #71 when we renamed the functional tests from e2e to functional, we missed the gitignore entry. This has resulted in the functional/mock-agent binary getting committed to the repo.

This PR removes that binary and adds the correct gitignore entry

Summary by CodeRabbit

• Chores
  • Updated repository configuration files.

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[coderabbitai]

Walkthrough

A single path replacement in the .gitignore file, changing e2e/mock-agent to functional/mock-agent. No functional changes to codebase behavior or control flow.

Changes

Cohort / File(s)	Summary
Configuration .gitignore	Replaced ignored path from e2e/mock-agent to functional/mock-agent

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: updating .gitignore to ignore the mock-agent binary in the functional directory, which directly aligns with the PR's primary objective.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[nader-ziada]

LGTM