fix(logging): improved TOCTOU risk mitigation and error messaging

[GingerGraham]

• addresses suggestions from feat: add TOCTOU race condition protection during log file creation and enhance related tests #49
• fixes part of [BUG] Recommended Fixes #52
• also updated Makefile to provide for parallel processing of linting

[Copilot]

Pull request overview

This PR improves TOCTOU (Time-of-Check-Time-of-Use) race condition mitigation in log file creation and enhances error messaging to provide clearer diagnostics when file creation fails. The changes address recommendations from issue #52 that were identified during review of PR #49.

Changes:

• Removed the existence check before atomic file creation to eliminate TOCTOU window where an attacker could create a symlink between the check and creation
• Added separate error messages distinguishing between "file doesn't exist" and "file exists but is wrong type" scenarios
• Added test-quiet Make target to suppress verbose test output
• Updated check Make target to explicitly list linting and testing dependencies

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
logging.sh	Improved TOCTOU mitigation by always attempting atomic file creation without pre-checking existence; enhanced error messages to distinguish between file creation failures and wrong file type errors
Makefile	Added test-quiet target for cleaner output and updated check target to explicitly depend on lint-shell, lint-markdown, and test-quiet