teernisse cca04bc11c Add CLI commands with structured errors and robot-mode behavior ...

Three cobra commands forming the CLI surface:
- root: fetch and filter weekly deals (--store/--zip with BOGO,
  category, department, query, and limit filters)
- stores: list nearby Publix locations by ZIP code
- categories: show available deal categories with counts

Structured error system with typed error codes (INVALID_ARGS,
NOT_FOUND, UPSTREAM_ERROR, INTERNAL_ERROR) and semantic exit codes
(0-4). Errors render as human-readable text or JSON depending on
output mode. Robot-mode features: auto-JSON when stdout is not a TTY,
compact quick-start help when invoked with no args, and JSON error
payloads for programmatic consumers.

2026-02-22 21:42:01 -05:00

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