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	0ms	1ms	N/A%
Full Refresh	55ms	765ms	53ms	2ms	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	75.8%
Base Branch Coverage	75.6%
Delta	.2% ✅

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Coverage increased! Great work!

[github-actions]

Test Coverage Report (Windows)

Metric	Value
Current Coverage	72.73%
Base Branch Coverage	72.49%
Delta	0.24% ✅

---

Coverage increased! Great work!

[github-actions]

Performance Report (macOS)

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta
Server Startup	86ms	851ms	85ms	1ms
Full Refresh	140ms	36354ms	175ms	-35ms

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	11ms	-2ms	-18.2%
Full Refresh	148ms	331ms	202ms	-54ms	-26.7%

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)