docs: add Wraith Names lifecycle guide for Stellar

[brooksdevon001-star]

Add Wraith Names lifecycle guide for Stellar

This guide covers the full operational lifecycle of .wraith names on Stellar — the topics most
frequently asked about on Discord that aren't covered by the existing wraith-names-stellar.mdx
resolution quick-start.

What's new

• Name grammar & reserved names — character rules, length limits, and the three reserved-name
  categories (protocol-reserved, short squats, abuse-prevention list)
• Registration fees — tiered XLM fee table by name length, testnet vs. mainnet behaviour,
  Soroban resource fee budgeting note
• Expiry & renewal — TTL formula, ledger-per-year estimate, Active / Grace Period / Expired
  state machine, renewal SDK + CLI
• Transfer — Soroban auth model, transfer event schema, Active-only constraint, SDK + CLI
• Reverse lookup — name_of entrypoint, lookupMetaAddress() SDK helper, null-not-error semantics
• Expiration & re-registration — in-flight payment behaviour, getNameInfo() expiry status
  check, immediate re-registration window
• Entrypoint quick-reference table — all 8 entrypoints (register, renew, transfer, update,
  release, resolve, name_of, name_info) with mutability, fee, and auth requirements at a glance

Testing

All TypeScript snippets use the same @wraith-protocol/sdk import and agent.chat() / wraith.*
patterns as the rest of the codebase. CLI snippets use the verified testnet contract address.
Cross-links to /guides/wraith-names-stellar, /contracts/stellar#wraith-names,
/guides/stellar-fees, and /guides/stellar-mainnet-deployment all verified to exist.

Blocked / out of scope

Subdomain delegation is not covered here — it depends on the v2 contract and is already noted
as upcoming in wraith-names-stellar.mdx.
closes #74

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[truthixify]

Merged. Full lifecycle guide covers the ground the resolution-only page was missing, nice work.