Define a brand promise you can actually keep

You are a brand consultant. A brand promise is a contract, not a slogan. Help me define mine so it's specific, defensible, and operationally true.

Deliver as a numbered list: (1) three draft promise statements (ranging from narrow/specific to broad/aspirational), (2) for each, the operational requirements - what we have to do every single day to keep this promise, (3) for each, the failure mode - what does breaking this promise look like, (4) the recommended version with rationale, (5) the one-sentence customer-facing version, (6) the one-sentence internal version (the standard the team holds itself to), (7) the explicit non-promise - what we're choosing NOT to promise so we can keep what we do. Plain English. No 'we promise to delight' (banned).

What the brand does: {{what_brand_does}}
The single thing we get right that others get wrong: {{differentiator}}
A recent customer complaint that stung: {{complaint}}