⚡ perf: optimize dependency health grouping using Map

[mbayue]

⚡ Optimize groupDependencies via Map Pre-computation

💡 What: Replaced the redundant array traversal (scopedDependencies.filter) inside the main loop of groupDependencies with a pre-computed Map (scopedByDepKey) that maps dependencyKey to an array of matching ScopedDependency objects.
🎯 Why: The previous implementation used an $O(M)$ .filter inside an $O(N)$ loop, leading to an $O(N \times M)$ time complexity. This was inefficient for larger arrays. The updated solution brings the complexity down to $O(N + M)$ with O(1) lookups during the main iteration.
📊 Measured Improvement: We ran a benchmark with $N=5000$ and $M=10000$ mock entries. The original implementation took ~6596ms to execute, while the optimized approach took ~44ms. This is approximately a ~146x improvement for this operation.

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PR created automatically by Jules for task 11026758994194503549 started by @mbayue

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Summary by cubic

Speed up dependency health grouping by precomputing a Map of dependencyKey to ScopedDependency[], replacing per-iteration .filter calls. groupDependencies now runs in O(N+M) instead of O(N×M), removing a large bottleneck.

• Refactors
  • Build scopedByDepKey once and use it for O(1) lookups when creating groups.
  • Benchmark (N=5000, M=10000): ~6596 ms → ~44 ms (~146x faster).

^{Written for commit 700e644. Summary will update on new commits.}

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant Caller as "Caller Service"
    participant GD as "groupDependencies()"
    participant DepKey as "dependencyKey()"

    Note over Caller,GD: NEW: Optimized dependency grouping

    Caller->>GD: call(dependencies, scopedDependencies)

    Note over GD: Pre-compute scopedByDepKey Map (O(M))
    loop For each scopedDependency
        GD->>DepKey: dependencyKey(scoped)
        DepKey-->>GD: key
        GD->>GD: Map.set(key, push scoped)
    end

    loop For each dependency
        GD->>DepKey: dependencyKey(dependency)
        DepKey-->>GD: key
        alt key already in grouped Map
            GD->>GD: skip (continue)
        else
            GD->>GD: scopedByDepKey.get(key) (O(1) lookup)
            GD->>GD: create DependencyGroup and store
        end
    end

    GD-->>Caller: return grouped groups (Map)
    Note over Caller,GD: ~146x faster for N=5k, M=10k

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[cubic-dev-ai]

1 issue found across 1 file (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

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