fix: make health events emission consistent

[weboko]

Problem / Description

Health indicator has difficult logic to comprehend leading to bugs being easily introduced.

Solution

Make clear re-calculation of health state on every event.

Notes

• Resolves bug: fix health events emission #2569

[Copilot]

Pull Request Overview

This PR refactors the HealthIndicator to make health state re-calculation more consistent and comprehensible by extracting the health assessment logic into a single method that is called on every relevant event.

• Extracts health assessment logic into a centralized assessHealth() method
• Adds initial health assessment when the indicator starts
• Simplifies event handlers to consistently call the assessment method

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/sdk/src/health_indicator/health_indicator.ts	Refactors health logic into assessHealth() method and adds initial assessment on start
packages/sdk/src/health_indicator/health_indicator.spec.ts	Updates tests to handle new behavior and adds comprehensive test coverage for edge cases

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
Waku node	70.43 KB (+0.03% 🔺)	1.5 s (+0.03% 🔺)	1.1 s (-11.87% 🔽)	2.5 s
Waku Simple Light Node	121.86 KB (-0.01% 🔽)	2.5 s (-0.01% 🔽)	1.2 s (-8.29% 🔽)	3.7 s
ECIES encryption	20.8 KB (0%)	417 ms (0%)	377 ms (-27.92% 🔽)	794 ms
Symmetric encryption	20.3 KB (0%)	407 ms (0%)	457 ms (+13.37% 🔺)	863 ms
DNS discovery	51.57 KB (0%)	1.1 s (0%)	967 ms (+10.79% 🔺)	2 s
Peer Exchange discovery	52.29 KB (0%)	1.1 s (0%)	817 ms (+25.57% 🔺)	1.9 s
Peer Cache Discovery	46.11 KB (0%)	923 ms (0%)	1.3 s (+90.31% 🔺)	2.2 s
Privacy preserving protocols	53.54 KB (0%)	1.1 s (0%)	859 ms (+6.24% 🔺)	2 s
Waku Filter	55.32 KB (0%)	1.2 s (0%)	1.2 s (-12.71% 🔽)	2.3 s
Waku LightPush	52.91 KB (0%)	1.1 s (0%)	816 ms (+2.41% 🔺)	1.9 s
History retrieval protocols	59.28 KB (0%)	1.2 s (0%)	1.2 s (+48.01% 🔺)	2.4 s
Deterministic Message Hashing	28.41 KB (0%)	569 ms (0%)	649 ms (+74.62% 🔺)	1.3 s