v0.4 — always-on shim + reject-to-learn

• tastecode shell-init — always-on shim aliases claude / codex / cursor-agent / opencode / aider through TasteCode.
• tastecode reject / accept / learn — transparent reject-to-learn loop with plain-markdown feedback log.
• Pointer-file installs for Claude Code, Cursor, Cline, Codex CLI, OpenCode, Aider.