SendIt OpenAI plugin and skill 1.1.2

SendIt plugin and standalone skill packages use the hosted OAuth MCP profile and document the corrected 0.1.3 terminal bridge.
The hosted implementation now has a dedicated content preview widget with platform mockups, character counts, and validation feedback.

Validation: 12 package tests pass, both ZIP inventories pass schema and secret checks, and builds are deterministic.

Public GitHub distribution is available now.
OpenAI directory submission remains incomplete until a verified reviewer demo, reviewer access, and developer attestations are supplied.