improve: harden gitignore and remove QA temp artifacts

[Coding-Dev-Tools]

Automated improvement by dev-engineer

[github-actions]

🤖 Automated Code Review

⚠️ Ruff Lint — 6 issue(s)

::error title=ruff (I001),file=/home/runner/work/envault/envault/tests/test_cli_edge_cases.py,line=12,endLine=18::tests/test_cli_edge_cases.py:12:1: I001 Import block is un-sorted or un-formatted%0A  help: Organize imports
::error title=ruff (I001),file=/home/runner/work/envault/envault/tests/test_encrypt_formats.py,line=7,endLine=9::tests/test_encrypt_formats.py:7:1: I001 Import block is un-sorted or un-formatted%0A  help: Organize imports
::error title=ruff (I001),file=/home/runner/work/envault/envault/tests/test_encrypt_secret_formats.py,line=7,endLine=10::tests/test_encrypt_secret_formats.py:7:1: I001 Import block is un-sorted or un-formatted%0A  help: Organize imports
::error title=ruff (I001),file=/home/runner/work/envault/envault/tests/test_history.py,line=3,endLine=7::tests/test_history.py:3:1: I001 Import block is un-sorted or un-formatted%0A  help: Organize imports
::error title=ruff (F403),file=/home/runner/work/envault/envault/tests/test_history.py,line=6,col=1,endLine=6,endColumn=30::tests/test_history.py:6:1: F403 `from envault.history import *` used; unable to detect undefined names
::error title=ruff (I001),file=/home/runner/work/envault/envault/tests/test_security_audit.py,line=3,endLine=12::tests/test_security_audit.py:3:1: I001 Import block is un-sorted or un-formatted%0A  help: Organize imports

⚠️ Ruff Format — Formatting needed

Would reformat: src/envault/audit.py
Would reformat: src/envault/auth.py
Would reformat: src/envault/backup.py
Would reformat: src/envault/cli.py
Would reformat: src/envault/config.py
Would reformat: src/envault/diff.py
Would reformat: src/envault/encrypt.py
Would reformat: src/envault/history.py
Would reformat: src/envault/rotate.py
Would reformat: src/envault/security_audit.py
Would reformat: src/envault/serve.py
Would reformat: src/envault/stores/__init__.py
Would reformat: src/envault/sync.py
Would reformat: tests/test_cli.py
Would reformat: tests/test_cli_edge_cases.py
Would reformat: tests/test_coverage_gaps.py
Would reformat: tests/test_encrypt_formats.py
Would reformat: tests/test_encrypt_secret_formats.py
Would reformat: tests/test_envault.py
Would reformat: tests/test_lint_regression.py
Would reformat: tests/test_security_audit.py
Would reformat: tests/test_serve.py
Would reformat: tests/test_stores_integration.py
Would reformat: tests/test_sync_coverage.py
24 files would be reformatted, 3 files already formatted

✅ Secret Detection — Clean

✅ Large Files — Within limits

📊 Diff Stats — 5 file(s) changed

 .gitignore           |  6 ++++
 _qa_repro_test.py    | 52 -----------------------------------
 _qa_test_scan.py     | 77 ----------------------------------------------------
 src/envault/serve.py |  2 +-
 test-file.txt        |  1 -
 5 files changed, 7 insertions(+), 131 deletions(-)

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Verdict: ⚠️ Warnings — Lint/format issues found. Recommend fixing before merge.

Automated by Coding-Dev-Tools/.github reusable workflow.