Python backend quickstart

[truthixify]

Tier: M (2-4 days) | Type: tutorial

Context. Stellar's Python SDK (stellar-sdk) has a large user base among fintech backends and treasury tools. Devs on Discord ask how to talk to Wraith contracts from Python without owning the TS toolchain. A quickstart that shows scan-key derivation, announcement fetch, and stealth send from Python covers that audience.

Scope.

• New guides/quickstarts/python.mdx.
• pip install stellar-sdk + minimal helper for stealth-key derivation.
• Fetch announcement events from Horizon / Soroban RPC.
• Scan for owned announcements.
• Send a stealth payment.
• Note the boundary: derivation crypto lives in a small utility file included inline.

Acceptance.

• Example runs on Python 3.11+ against futurenet
• Python fences marked no-check for TS gate
• Renders in mint dev
• Nav entry under Guides
• Cross-linked from sdk/overview.mdx

Files. guides/quickstarts/python.mdx (new), sdk/overview.mdx, docs.json.