Stellar fee estimation + budgeting guide

[truthixify]

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

Context

Stellar has classic op fees, Soroban resource fees, fee-bump envelopes, and surge pricing. Predictable budgeting requires understanding all four. One guide makes it concrete.

Scope

Write docs/guides/stellar-fees.mdx:

• Classic op fee model (base fee × op count)
• Soroban resource fee components (instructions, mem, read/write entries, bytes)
• Network surge pricing
• Fee-bump transaction mechanics (when to use, who pays)
• Per-Wraith-operation typical fees on testnet (with stellar/PERF.md numbers)
• SDK fee-estimation helper usage
• Budgeting heuristics for production apps

Acceptance criteria

• Page committed
• Numbers cited from contracts/stellar/PERF.md baseline
• Worked examples for send / withdraw / batch
• Linked from SDK + quickstart

Files to start with

• New: docs/guides/stellar-fees.mdx
• contracts/stellar/PERF.md