readseek 0.8.18

readseek:
- release: bump marketplace plugin entry versions (Jarkko Sakkinen)
- claude: more shoehorning and polishing of the plugin (Jarkko Sakkinen)
- release: update npm package integrity metadata (Jarkko Sakkinen)

pi-readseek:
- claude: ship MCP navigation tools (Jarkko Sakkinen)
- release: update npm package integrity metadata (Jarkko Sakkinen)

opencode-readseek:
- claude: ship MCP navigation tools (Jarkko Sakkinen)
- release: update npm package integrity metadata (Jarkko Sakkinen)

claude-readseek:
- claude: more shoehorning and polishing of the plugin (Jarkko Sakkinen)
- claude: add structural-nav skill for MCP vs hooks (Jarkko Sakkinen)
- claude: ship MCP navigation tools (Jarkko Sakkinen)
- release: update npm package integrity metadata (Jarkko Sakkinen)

readseek.vim:
- Merged readseek.vim into this repository.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@iki.fi>