Add search command and extended card list filters

[robzolkos]

Summary

• Add fizzy search command for quick text searches with basic filters
• Add new flags to fizzy card list for full API coverage

fizzy search (new command)

fizzy search "bug"
fizzy search "login error"              # Multiple terms (AND)
fizzy search "bug" --board BOARD_ID
fizzy search "bug" --indexed-by closed  # Include closed cards
fizzy search "bug" --sort newest

fizzy card list (new flags)

Flag	API Parameter	Description
--search	terms[]	Search by text
--sort	sorted_by	newest, oldest, latest
--creator	creator_ids[]	Filter by creator
--closer	closer_ids[]	Filter by who closed
--unassigned	assignment_status	Only unassigned cards
--created	creation	today, yesterday, thisweek, etc.
--closed	closure	today, yesterday, thisweek, etc.

Test plan

• Unit tests for fizzy search (6 tests)
• Unit tests for new card list flags (7 tests)
• Manual testing against live API
• All 134 tests pass