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.

從 learn-taste 命令的工作階段探索邏輯入手，追蹤它目前如何選取 ~/.claude/projects/。將其行為與 CLAUDE_CONFIG_DIR、--claude-config-dir 旗標以及相對於專案的 .claude/projects/ 路徑進行比較；當無需符號連結替代方案即可找到來自受支援之非標準位置的工作階段時，即視為完成。