v0.4.0

Changed

• Trace maintenance now only deletes trace data files (.jsonl / .jsonl.gz) after the retention
  horizon; other files in the trace directory are left alone instead of being swept — applies to
  both lore trace prune and the SessionStart-triggered lazy maintenance pass. (#60)

Added

• MCP add_pattern and update_pattern accept an optional language argument that opts the
  pattern into the structural retrieval gate, warn-and-proceed for unknown tokens. (#63)
• lore status inserts a new Languages: line between Sources: and Last commit: reporting a
  per-language source-count breakdown plus an undeclared bucket; the same data is exposed as
  languages_declared / languages_undeclared on the MCP lore_status tool's metadata fence for
  agent or script consumers. (#58)
• Add opt-in per-hook trace logging under $XDG_STATE_HOME/lore/traces/ with lore trace why query
  CLI and lore trace prune maintenance. (#59)
• lore detects 21 new languages: C, C++, C#, Swift, Kotlin, Shell, Objective-C, Scala, Elixir,
  Dart, Lua, Nix, Terraform, Haskell, Clojure, Zig, Perl, Ruby, Java, Groovy, and PHP. (#61)

Fixed

• Hook-driven language detection now reads both command and description from Bash tool calls;
  previously a populated description shadowed the command and silently no-op'd the structural
  retrieval gate for nearly every real Bash invocation. (#62)
• Path-prefixed Bash invocations like ./gradlew, /usr/local/bin/cargo, and ~/.cargo/bin/cargo
  are basename-normalised before keyword matching, so they resolve to their canonical language
  instead of failing the keyword allow-list. (#62)