feat: add --require-license strict mode flag

[Coding-Dev-Tools]

feat: add --require-license strict mode flag

Closes #32

Changes

• Added --require-license flag to the main CLI group
• Supported REVENUEHOLDINGS_REQUIRE_LICENSE=1 environment variable
• When set and revenueholdings-license is not installed: exits with a clear error message
• When set and license check fails: propagates the error

Usage

# Exit with error if license not installed
configdrift --require-license <command>

# Or via env var
REVENUEHOLDINGS_REQUIRE_LICENSE=1 configdrift <command>

Acceptance Criteria

• --require-license flag added to main CLI group
• REVENUEHOLDINGS_REQUIRE_LICENSE env var supported
• When set and package not installed: exit with clear error
• When set and license check fails: propagate the error
• Documented in README (follow-up)

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Generated by Claude Code

[github-actions]

🤖 Automated Code Review

✅ Ruff Lint — No issues

⚠️ Ruff Format — Formatting needed

Would reformat: src/configdrift/cli.py
Would reformat: src/configdrift/diff.py
Would reformat: src/configdrift/loader.py
Would reformat: tests/test_cli.py
Would reformat: tests/test_coverage_gaps.py
Would reformat: tests/test_diff.py
Would reformat: tests/test_loader.py
7 files would be reformatted, 2 files already formatted

✅ Secret Detection — Clean

✅ Large Files — Within limits

📊 Diff Stats — 1 file(s) changed

 src/configdrift/cli.py | 63 +++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 47 insertions(+), 16 deletions(-)

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

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