docs: update all paths to consolidated .local/hexai directory

Update all documentation to reflect new directory structure:
- Cache: ~/.local/hexai/cache/
- State: ~/.local/hexai/state/
- Data: ~/.local/hexai/data/

Updated files:
- README.md
- docs/mcp-setup.md
- docs/mcp-prompts.md
- docs/mcp-managing-prompts.md
- docs/mcp-features-summary.md
- docs/mcp-automatic-backups.md
- docs/mcp-server-complete.md

Amp-Thread-ID: https://ampcode.com/threads/T-019c4e03-73db-70a2-ae27-3e1cc31d59c3
Co-authored-by: Amp <amp@ampcode.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/docs/mcp-automatic-backups.md b/docs/mcp-automatic-backups.md
index ccc0734..87ec329 100644
--- a/docs/mcp-automatic-backups.md
+++ b/docs/mcp-automatic-backups.md
@@ -57,7 +57,7 @@ Every operation through the MCP server automatically creates a backup:
 
 ### Storage Location
 ```
-~/.local/share/hexai/prompts/backups/
+~/.local/hexai/data/prompts/backups/
 ├── user.jsonl.20260210-190358
 ├── user.jsonl.20260210-192145
 ├── user.jsonl.20260210-193422
@@ -122,7 +122,7 @@ In rare cases where you need to manually restore:
 
 ### List Backups
 ```bash
-ls -lht ~/.local/share/hexai/prompts/backups/
+ls -lht ~/.local/hexai/data/prompts/backups/
 ```
 
 Output:
@@ -135,8 +135,8 @@ Output:
 ### Restore from Backup
 ```bash
 # Copy backup to restore
-cp ~/.local/share/hexai/prompts/backups/user.jsonl.20260210-193422 \
-   ~/.local/share/hexai/prompts/user.jsonl
+cp ~/.local/hexai/data/prompts/backups/user.jsonl.20260210-193422 \
+   ~/.local/hexai/data/prompts/user.jsonl
 
 # Restart MCP client to reload
 ```