fix(ai): default analyzer logger when omitted

[iccccccccccccc]

Fixes #126

Changes

• Default AnalyzerConfig.Logger to a discard slog logger when omitted
• Add coverage proving NewAnalyzer can run Analyze without a caller-provided logger

Verification

• go test ./internal/ai -count=1
• go test ./... -count=1

[github-actions]

🚀 First PR — welcome aboard!

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If you get stuck, reply here or jump to Discussions. We want this PR to land.

[btwshivam]

/ok-to-test

[github-actions]

No pending workflow runs found on ead09dd. Label applied. If CI should be running but isn't, push a fresh commit.

[btwshivam]

thanks for working..

[btwshivam]

/lgtm