fix: tolerate pyenv patch version mismatch in CI test (Fixes #371)

[karthiknadig]

The CI test verify_validity_of_discovered_envs fails when pyenv's directory name version (e.g. 3.12.13) doesn't match the binary's sys.version (e.g. 3.12.12) during CPython version transitions.

Changes:

• For Pyenv environments, tolerate patch-level version mismatches in both verify_validity_of_interpreter_info and compare_environments, asserting major.minor still matches
• Use splitn(3, '.') for robust major.minor extraction (handles dev/alpha versions)
• Log a warn!() diagnostic when a patch mismatch is detected
• All other environment types retain the strict full-version assertion

Fixes #371

[github-actions]

Test Coverage Report (Linux)

Metric	Value
Current Coverage	64.0%
Base Branch Coverage	64.0%
Delta	0% ➖

---

Coverage unchanged.

[github-actions]

Performance Report (Linux) ➖

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta	Change
Server Startup	1ms	1ms	1ms	0ms	0%
Full Refresh	98ms	251ms	97ms	1ms	0%

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	165ms	1506ms	229ms	-64ms	-27.9%

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]

Test Coverage Report (Windows)

Metric	Value
Current Coverage	60.21%
Base Branch Coverage	60.21%
Delta	0% ➖

---

Coverage unchanged.

[github-actions]

Performance Report (macOS)

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta
Server Startup	81ms	770ms	47ms	34ms
Full Refresh	165ms	31965ms	101ms	64ms

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)

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