chore: bump version 0.8.0 → 0.8.1

dogfood-discovered code_lang/repo filter bug (PR #144) fix lands in
production. patch bump because:
- 1A-1 advertised CLI flags --code-lang / --repo were live but inert
  (SearchFilters fields propagated but never applied to retriever SQL)
- fix restores intended behavior; no new wire surface
- user has dogfooded against httpx + zod + lodash and re-validating
  needs the fixed binary

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -31,7 +31,7 @@ edition       = "2024"
 rust-version  = "1.85"
 license       = "MIT OR Apache-2.0"
 repository    = "https://github.com/altair823/kebab"
-version       = "0.8.0"
+version       = "0.8.1"
 
 [workspace.dependencies]
 anyhow       = "1"