Adds flagspec_t descriptor table, getopt_long option-table builder, and the shared stderr-routed rejection path that every flag-accepting command will migrate onto in later tasks. TDD'd via test_flagspec.c (1273/1273 controller suite passing). Task 1.1 of .kiro/specs/xce-test-cli-ux/tasks.md. Requirements: 2.1, 2.2, 2.3, 2.4, 3.1 Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019jaMf9QEwpugH2W9KAuc7f |
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