learn-taste: support non-standard Claude Code config paths (e.g. CLAUDE_CONFIG_DIR)

Context: Some projects use a shared Claude Code config directory at a non-standard path (e.g. ~/Developer/Work/Busie/.claude/) instead of the default ~/.claude/.

Problem: The learn-taste command hardcodes session discovery to ~/.claude/projects/. For Busie's fe-main project, this meant only 11 sessions were found in the standard location, while 33 sessions existed at ~/Developer/Work/Busie/.claude/projects/-Users-jasonschulz-Developer-Work-Busie-fe-main/.

Workaround applied: Symlinked the non-standard sessions into the standard location:

ln -sf ~/Developer/Work/Busie/.claude/projects/-Users-jasonschulz-Developer-Work-Busie-fe-main/* ~/.claude/projects/-Users-jasonschulz-Developer-Work-Busie-fe-main/

Suggested fix: Add support for discovering sessions from non-standard Claude Code config directories. Options:

• Detect CLAUDE_CONFIG_DIR environment variable if set
• Add a --claude-config-dir flag to learn-taste
• Scan for .claude/projects/ relative to the project root (e.g. ../../.claude/projects/ for monorepo sub-projects)

This would make taste learning work out-of-the-box for teams using shared or project-scoped Claude Code configurations.

从 learn-taste 命令的会话发现逻辑入手，追踪它当前如何选择 ~/.claude/projects/。将其行为与 CLAUDE_CONFIG_DIR、--claude-config-dir 标志以及相对于项目的 .claude/projects/ 路径进行比较；当无需符号链接变通方案即可找到来自受支持的非标准位置的会话时，即视为完成。