fix(apollo-forest-run): index covered operations

[vladar]

Fix a minor perf regression in ForestRun affecting slow-path reads (related to #642).

Before: ForestRun redundantly loops through all operations in the forest to detect covered operations
After: tracks covered operations in a Map, allowing faster lookups (avoids looping through all operations)

[github-actions]

📊 Benchmark Analysis Report

🔍 Found 3 significant change(s)

🎯 Same Configuration Comparisons

Comparing against baseline with the same cache configuration

Benchmark ID	Configuration	Execution	Memory
write-no-changes_0	Default		🟢 4398.12 bytes → 3710.00 bytes (-15.6%)
modify-affecting-0-objects_0	Default		🟢 3844.23 bytes → 3442.04 bytes (-10.5%)
modify-affecting-0-objects_50	Default	🟢 10517.43 ns → 9812.66 ns (-6.7%)

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Threshold: 5% change

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Updated: 2026-04-10T17:48:13.610Z