v0.3.1

Added

• list command alias for ls
• TICKET_PAGER environment variable for show command (only when stdout is a TTY; falls back to PAGER)

Changed

• Walk parent directories to find .tickets/ directory, enabling commands from any subdirectory
• Ticket ID suffix now uses full alphanumeric (a-z0-9) instead of hex for increased entropy

Fixed

• dep command now resolves partial IDs for the dependency argument
• undep command now resolves partial IDs and validates dependency exists
• unlink command now resolves partial IDs for both arguments
• create --parent now validates and resolves parent ticket ID
• generate_id now uses 3-char prefix for single-segment directory names (e.g., "plan" → "pla" instead of "p")