chore: remove redundant auto-claude/specs directory

Specs are stored in .auto-claude/specs/ (per-project, gitignored).
The auto-claude/specs/ folder was legacy and no longer used.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

auto-claude/memory/paths.py

@@ -14,7 +14,7 @@ def get_memory_dir(spec_dir: Path) -> Path:
     Get the memory directory for a spec, creating it if needed.
 
     Args:
-        spec_dir: Path to spec directory (e.g., auto-claude/specs/001-feature/)
+        spec_dir: Path to spec directory (e.g., .auto-claude/specs/001-feature/)
 
     Returns:
         Path to memory directory

auto-claude/specs/.gitkeep

@@ -1,7 +0,0 @@
-# This directory contains all spec folders
-# Each spec is stored in a numbered folder like:
-#   001-initial-app/
-#   002-user-auth/
-#   003-payment-integration/
-#
-# Create a new spec with: claude /spec