Stellar multisig stealth withdrawal guide

[truthixify]

Tier: M (2-4 days) Type: writing

Context

Stealth withdrawals from multisig source accounts require careful coordination (signer weight, threshold, ordering). SDK will gain helpers; docs need to show patterns.

Scope

Write docs/guides/stellar-multisig-withdrawal.mdx:

• Stellar native multisig primer
• Building a multisig-source-account stealth withdrawal
• Coordinating N signatures (sequence, weight, transfer)
• Using the SDK multisig helpers
• Recovery scenarios (lost signer, threshold change)
• Worked 3-of-5 example end-to-end

Acceptance criteria

• Page committed
• 3-of-5 example verified on futurenet
• Linked from SDK Stellar + Security overview

Files to start with

• New: docs/guides/stellar-multisig-withdrawal.mdx