fix: filter out WSL Windows drive mount paths in conda locator (Fixes #369)

[karthiknadig]

On WSL2, ~/.conda/environments.txt is shared with the Windows host and contains paths like /mnt/d/Tools/Anaconda/envs/... that point to Windows PE executables unusable from Linux. PET would try to find a conda manager for each, fail, and log ERROR for every environment — causing log spam and ~6s overhead.

Changes:

• Add is_windows_drive_mount() helper (Unix-only) to detect /mnt/<drive>/... paths
• Add is_wsl() helper using /proc/version WSL signature detection with result caching
• Filter out Windows drive mount paths early in get_conda_environment_paths() before expensive scanning
• Unit tests for the path matching logic (Unix-gated)

Fixes #369

[github-actions]

Test Coverage Report (Linux)

Metric	Value
Current Coverage	64.1%
Base Branch Coverage	64.0%
Delta	.1% ✅

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Coverage increased! Great work!

[github-actions]

Performance Report (Linux) ➖

Metric	PR (P50)	PR (P95)	Baseline (P50)	Delta	Change
Server Startup	1ms	1ms	1ms	0ms	0%
Full Refresh	99ms	485ms	97ms	2ms	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	15ms	11ms	-2ms	-18.2%
Full Refresh	163ms	1602ms	229ms	-66ms	-28.8%

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	67ms	623ms	51ms	16ms
Full Refresh	130ms	29717ms	102ms	28ms

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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