fix(v0.2.0): resolve TUI crash and setup wizard errors

- Fix unbalanced parens in config-manager (set-config-value, setup-gateways)
- Fix assoc :key #'car SBCL compatibility issue in setup-llm-providers
- Add missing generate-tool-belt-prompt function
- Fix deterministic-verify to not overwrite action when skills return nil
- Add :explanation to think fallback responses for policy compliance
- Update opencortex.sh to tangle from repo org to XDG .lisp
- Remove generated .lisp artifacts from repo (skills, tests, state)

.env.example

@@ -1,11 +1,6 @@
 # opencortex: Environment Configuration Template
 # Copy this to .env and fill in your values
 
-# =============================================================================
-# INSTALLATION
-# =============================================================================
-INSTALL_DIR="$HOME/.opencortex"
-
 # =============================================================================
 # IDENTITY
 # =============================================================================
@@ -76,7 +71,6 @@ CONTEXT_LOG_LIMIT=20
 # MEMEX STRUCTURE
 # =============================================================================
 MEMEX_DIR="$HOME/memex"
-SKILLS_DIR="skills/"
 ZETTELKASTEN_DIR="$HOME/memex/notes"
 INBOX_DIR="$HOME/memex/inbox"
 DAILY_DIR="$HOME/memex/daily"