Refine grant funding narrative

[horn111]

Description

Refines the grant-facing project narrative after the durability update.

This updates docs/grant.md so the repo tells a clearer funding story: the local Arc Receipts flow is already proven, and grant funding would move it toward reusable production-facing infrastructure for Arc builders.

Type of Change

• Documentation update
• Bug fix
• New feature
• Breaking change
• Refactoring

Key Changes

• Clarifies the project one-liner around operable Arc + USDC payments.
• Updates the built-feature list to include persistent receipts, SQLite local persistence, watcher cursors, persistent webhook inbox, and route helper support.
• Adds a Why Funding Is Needed section.
• Reframes grant milestones around the next funded phase: Postgres persistence, durable watcher runtime, framework integrations, refunds, and hosted reviewer/builder demo work.
• Updates current limits so they match the latest durability work.

Verification

• git diff --check -- docs\grant.md

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Project	Deployment	Actions	Updated (UTC)
arc-nano-kit-demo	Ready	Preview, Comment	Jul 9, 2026 7:03pm