fix: update resume help test for message field parity (#338)

Changed resumed_help_command_emits_structured_json to assert 'message'
field instead of 'text', matching the #338 fix for help JSON field
consistency.

Also marked ROADMAP #340 and #345 DONE with direct runtime evidence:
340: resume /session help now routes JSON to stdout (verified)
345: resume /config <section> now returns section-specific JSON (verified)

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Co-authored-by: Gajae Code <dev@gajae-code.com>

Author: 2 people