fix(balance-analyser): emit real patrol radius, not spawn rate (closes #124)

[hyperpolymath]

Summary

Closes #124.

tools/balance-analyser.jl:761 was emitting stats.guard_spawn_rate as the value of the guard_patrol_radius recommendation. Three of seven recommendations in balance-report.json (city, security, backbone) were corrupted by this — wrong units, wrong magnitudes, gameplay-meaningless.

Option A fix (per #124):

• Add mean_patrol_radius::Float64 to LevelStats (in pixels, matching LevelConfig.res)
• Compute it as the mean of all guardPlacements[].patrolRadius in level_dict_to_stats
• Reference it correctly at the recommendation call site
• Emit mean_patrol_radius in the JSON output
• Mirror as meanPatrolRadius: float in BalanceAnalyserModel.levelSummary + parser

Test plan

• julia tools/balance-analyser.jl regenerates balance-report.json with patrol_radius recommendations in pixels (e.g. ~210→179 for backbone) rather than spawn-rate units
• npx rescript succeeds — meanPatrolRadius field add is purely additive
• Four pre-existing valid recommendations (alert_threshold, defence_density, guard_spawn_rate ×2) unaffected

Follow-up

`balance-report.json` regeneration + applying the four valid recommendations to per-level configs lands in idaptik#19 once this merges.

Closes #124
Refs #19

🤖 Generated with Claude Code

[github-actions]

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Findings: 71 issues detected

Severity	Count
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🟠 High	18
🟡 Medium	42

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