Expand CI test coverage

[Darkroom4364]

Closes #94

Summary

• add server HTTP polling lifecycle tests for heartbeat registration, command drain, result deobfuscation, and malformed/listener route rejection
• expand operator API tests for agent listing, body/path command queueing, result retrieval, and invalid command requests
• add agent tests for XOR obfuscation, jitter bounds, token-aware command classification, and deterministic download/SOCKS checks without external services

Verification

• server: go test ./...
• server: go vet ./...
• server: go build -o /private/tmp/microc2-server-ci ./cmd
• agent: cargo fmt --check
• agent: cargo test --locked
• agent: cargo clippy --locked --all-targets (passes with existing warnings)
• agent: cargo build --locked (passes with existing warnings)
• Foxguard: npx foxguard@latest diff --format json origin/dev . -> 0 new issues

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue/94-expand-ci-test-coverage

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