fix: shorten MCP server name to prevent tool name length errors (#360)

* fix: shorten MCP server name to prevent tool name length errors (#358)

Root cause: Claude Code prefixes MCP tool names with
`mcp__plugin_{plugin-name}_{server-name}__` which was 43 chars
for `mcp__plugin_claude-mem_claude-mem-search__`. Combined with
`progressive_description` (22 chars) this exceeded the 64 char limit.

Changes:
- Shortened MCP server name from 'claude-mem-search' to 'mem-search'
  (saves 8 chars, new prefix is 35 chars)
- Renamed `progressive_description` tool to `help` (saves 18 chars)
- Updated SKILL.md to reference new `help` tool name
- Updated internal Server constructor name for consistency

All tool names now safely under 64 char limit:
- Longest is now `get_batch_observations` at 56 chars total
- `help` is only 39 chars total

Fixes #358

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

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

* refactor: rename get_batch_observations to get_observations

The plural form naturally implies multiple items can be fetched,
following WordPress conventions. Simpler and clearer naming.

Also saves 6 additional characters for MCP tool name length.

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

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

* docs: update all references to renamed MCP tools

Updated documentation and code comments to reflect:
- progressive_description → help
- get_batch_observations → get_observations

Files updated:
- docs/public/usage/claude-desktop.mdx
- docs/public/architecture/worker-service.mdx
- src/services/worker/FormattingService.ts

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

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

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

docs/public/architecture/worker-service.mdx

@@ -240,7 +240,7 @@ POST /api/observations/batch
 - `400 Bad Request`: `{"error": "ids must be an array of numbers"}`
 - `400 Bad Request`: `{"error": "All ids must be integers"}`
 
-**Use Case**: This endpoint is used by the `get_batch_observations` MCP tool to efficiently retrieve multiple observations in a single request, avoiding the overhead of multiple individual requests.
+**Use Case**: This endpoint is used by the `get_observations` MCP tool to efficiently retrieve multiple observations in a single request, avoiding the overhead of multiple individual requests.
 
 #### 9. Get Session by ID
 ```

docs/public/usage/claude-desktop.mdx

@@ -118,12 +118,12 @@ The skill provides access to these MCP tools:
 | `search` | Unified search across observations, sessions, and prompts |
 | `timeline` | Get chronological context around a query or observation ID |
 | `get_observation` | Fetch a single observation by ID |
-| `get_batch_observations` | Fetch multiple observations efficiently |
+| `get_observations` | Fetch multiple observations efficiently |
 | `get_session` | Fetch session summary by ID |
 | `get_prompt` | Fetch user prompt by ID |
 | `get_recent_context` | Get recent timeline items |
 | `get_context_timeline` | Get timeline around a specific observation |
-| `progressive_description` | Load detailed usage instructions |
+| `help` | Load detailed usage instructions |
 
 ## Troubleshooting