test: expand telemetry coverage

[karthiknadig]

Adds 13 new unit tests to pet-telemetry (from 4 to 17 total).

New coverage:

• are_versions_different(): same version, different patch/minor, version suffixes, non-version strings, empty strings
• Executable mismatch detection and None handling
• Executable not in symlinks detection (accounts for builder auto-adding exe to symlinks)
• Architecture mismatch detection and None handling
• Version mismatch end-to-end

Fixes #389

[github-actions]

Performance Report (Linux) ✅

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta	Change
Server Startup	1ms	1ms	1ms	0ms	0%
Full Refresh	53ms	103ms	57ms	-4ms	0%

Results based on 10 iterations. P50 = median, P95 = 95th percentile.

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Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)

[github-actions]

Test Coverage Report (Linux)

Metric	Value
Current Coverage	75.1%
Base Branch Coverage	74.9%
Delta	.2% ✅

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Coverage increased! Great work!

[github-actions]

Test Coverage Report (Windows)

Metric	Value
Current Coverage	71.97%
Base Branch Coverage	71.72%
Delta	0.25% ✅

---

Coverage increased! Great work!

[github-actions]

Performance Report (macOS)

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta
Server Startup	73ms	597ms	57ms	16ms
Full Refresh	159ms	31901ms	130ms	29ms

Results based on 10 iterations. P50 = median, P95 = 95th percentile.

---

Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)

[github-actions]

Performance Report (Windows) ✅

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta	Change
Server Startup	9ms	12ms	9ms	0ms	0%
Full Refresh	139ms	350ms	147ms	-8ms	-5.4%

Results based on 10 iterations. P50 = median, P95 = 95th percentile.

---

Legend

• 🚀 Significant speedup (>100ms faster)
• ✅ Faster than baseline
• ➖ No significant change
• 🔺 Slower than baseline (>100ms)
• ⚠️ Significant slowdown (>500ms)