docs(sip-03): add Seistream association tool, drop closed Stargate pools

[alexander-sei]

Summary

Updates the SIP-03 migration guide and the ecosystem-contracts registry to add the Seistream address-association tool and remove migration routes/pools that are now closed.

learn/sip-03-migration.mdx

• New "Address Association (Seistream)" section describing seistream.app/migrate-sip03 — a community-built tool that links a user's EVM (0x…) and Cosmos (sei1…) addresses for the native SEI token in three steps (connect wallet → gas + association → transfer from Cosmos). Includes a cross-link Tip from the manual hardware/mnemonic-wallet flow. Faucet wording is deliberately scoped to what the live page supports (the page does not advertise gas coverage as a hard guarantee).
• Removed the closed Stargate USDC.n and USDT.kava routes from the IBC asset migration table.
• Rewrote USDC.n "Migrate (larger amounts)" to the real IBC path — USDC.n → Noble (IBC) → Circle CCTP → native USDC on Sei, with CCTP Exchange as the CCTP-leg frontend — and dropped the dead brrr.fun batching tool.

snippets/ecosystem-contracts.jsx

• Removed the two wound-down Stargate pools. Despite its name, StargatePoolUSDC (0x45d417…) is backed by USDC.n (token() → 0x3894085…, symbol USDC.n), not native USDC; StargatePoolMigratable (0x0db9af…) is backed by USDT.kava. Both verified on-chain via token()/symbol(). StargateOFT (WETH) and the shared infra contracts (FeeLibV1, Treasurer, TokenMessaging) are retained, since Stargate itself remains operational.

Verification

• Confirmed zero remaining Stargate/brrr.fun references on the migration page; evm/bridging/layerzero.mdx (LayerZero contract ref) and evm/sei-js/ledger.mdx (@cosmjs/stargate) are intentionally untouched.
• Verified all in-page anchors resolve and the new Tip/Warning callouts are well-formed.
• Verified the ecosystem-contracts data array stays syntactically valid after removing the two objects.

Follow-up (not in this PR)

• llms-full.txt is generated and still mirrors the pre-edit content (old Stargate routes ~L1491–1529 and the removed pool list ~L40670+). It should be regenerated so the LLM-facing copy matches. No generation script was found in package.json; happy to run whatever command the team uses.

🤖 Generated with Claude Code

[cursor]

PR Summary

Low Risk
Documentation and static contract registry edits only; no application or on-chain logic changes.

Overview
Updates the SIP-03 migration guide and ecosystem contract list so guidance matches closed bridges and adds a guided native-SEI association path.

In learn/sip-03-migration.mdx, the IBC table drops Stargate as a route for USDC.n and USDT.kava (USDC.n routes now point at DEX/CCTP frontends; USDT.kava is Symphony-only). Large USDC.n migration is rewritten to Sei → Noble (IBC) → CCTP → native USDC, replacing the old Stargate/intermediary-chain flow. A new Address Association (Seistream) section documents the community tool for linking 0x… / sei1… and moving native SEI only, with Warning/Tip callouts and a cross-link from the manual hardware/mnemonic flow; Seistream is added to page keywords.

In snippets/ecosystem-contracts.jsx, two wound-down Stargate pool entries (StargatePoolUSDC, StargatePoolMigratable) are removed while other Stargate infra rows stay listed.

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