Chore: remove + gitignore Assets/_Recovery (Unity auto-recovery scenes)

These are editor crash-recovery scene dumps (not project content) that had been accidentally committed. Removed from the repo + disk and added to .gitignore so future recovery dumps stay out of git.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Recovery.meta

@@ -1,8 +0,0 @@
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-folderAsset: yes
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Assets/_Recovery/0 (1).unity.meta

@@ -1,7 +0,0 @@
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-guid: 63b0477da41e2bb4dab1165e6ef6fd4a
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Assets/_Recovery/0 (2).unity.meta

@@ -1,7 +0,0 @@
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Assets/_Recovery/0 (3).unity.meta

@@ -1,7 +0,0 @@
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-guid: 372b8f8077a280246b6b8d0de3e4797c
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Assets/_Recovery/0.unity.meta

@@ -1,7 +0,0 @@
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-guid: 0b6fb78380a9249488262ddd760135d2
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