refactor(infra): extract magic numbers in get-cable-health into named constants

[NewCoder3294]

Summary

• Extracted all magic numbers (thresholds, severities, confidences, TTLs, distance constants, evidence limits, rounding factors) from get-cable-health.ts into well-named UPPER_SNAKE_CASE constants at the top of the file
• Constants are grouped by category (geo/proximity, time, fault signals, advisory signals, repair activity, health status thresholds, evidence limits, rounding) with brief section comments
• No logic changes — all runtime behavior is identical

Test plan

• Verify TypeScript compilation passes (npm run typecheck)
• Confirm all constant values match the original magic numbers
• Review that no code paths were altered, only number literals replaced with constant references

🤖 Generated with Claude Code

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