Memory recall for continuation, release, return, connector

Key features

• Injects the Nowledge Mem Context Bundle once per DSH session through agent/pre-step.
• Runs prompt-time memory recall for continuation, release, regression, connector, plugin, and other recall-shaped prompts.
• Adds the Mem MCP server through DSH's @deepseek-ai/dsh-mcp-client, so tools appear as mcp__nowledge_mem__....
• Imports the real DSH surface transcript after completed turns with nmem t import --source deepseek-harness.
• Stamps CLI imports with NMEM_IMPORT_ORIGIN=deepseek-harness.