Add TRC-8126: AI Agent Verification (Final)

[yanghang8612]

Adds TRC-8126 (tip-8126.md) at Final, the TRON adaptation of ERC-8126 (now Final upstream).

• What: a standard for multi-layer security verification of AI agents — five verification types (ETV / MCV / SCV / WAV / WV), PDV/ZKP privacy, optional QCV, and a unified 0–100 risk score.
• Positioning: TRC-8126 is a specialized security-verification provider within the TRC-8004 framework, not a separate registry — TRC-8004 owns identity/discovery, TRC-8126 owns "how safe is it to interact?". Results are posted as attestations to TRC-8004's Validation Registry (validationResponse, tag: "trc-8126"), consistent with ERC-8126's pluggable-validation approach.
• TRON profile: off-chain-verification / on-chain-commitment architecture (no native zk/DA layer required); addresses as 20-byte (0x41 stripped); TIP-712 chainId (block.chainid & 0xffffffff) + verifyingContract for replay protection; contract-presence via wallet/getcontract; fees via TRC-3009 gasless stablecoin (USDD/USDT) instead of ERC-3009/USDC.
• Scope: specification only for V1 (no reference implementation); off-chain provider bootstrapping left as an open ecosystem task. Reflects the alignment reached in the discussion.
• Discussion: [Discussion] TRC-8126: Introduce ERC-8126 (AI Agent Registration and Verification) for TRON #832

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