Persistence format version mismatch: expected 1, got 25165826

[Liorrr]

Bug

ShrimPK MCP server fails on all store/echo operations with:

MCP error -32603: Engine init failed: Persistence error: Unsupported format version: expected 1, got 25165826

Reproduction

1. Start shrimpk-mcp (via Claude Code MCP config)
2. Call any tool (store, echo, stats, etc.)
3. All fail with the above error

Analysis

The data file at ~/.shrimpk-kernel/ appears to have a format version byte of 25165826 (0x01800002) instead of 1. This suggests either:

• Data file corruption
• A version upgrade changed the serialization format without a migration path
• The file was written by a newer/different version of the daemon

Expected

MCP server should either:

1. Successfully read the data file, or
2. Provide a clear migration path / instructions to upgrade the data format

Environment

• Windows 11 Pro
• ShrimPK kernel v0.7.0 (latest master)
• MCP server (stdio mode)