chore: bump version to 1.0.3

Adds --threshold flag for ask command, configurable min_similarity.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ariel-frischer

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "kb"
-version = "1.0.2"
+version = "1.0.3"
 description = "CLI knowledge base: index markdown + PDFs, hybrid search, RAG answers. Powered by sqlite-vec."
 readme = "README.md"
 license = "MIT"