Add Blend v2 integration test suite

[aditya1702]

Deploys the full Blend v2 protocol stack (Comet BLND:USDC LP, mock SEP-40 oracle, emitter, pool factory, backstop, one pool with USDC/XLM reserves) on the standalone integration-test network — replicating blend-utils' mock-example.ts deployment order (pinned commit b05242df, wasm provenance + sha256s in infrastructure/testdata/blend/README.md) — then executes real Blend operations and asserts DB state and GraphQL responses through both ingestion paths.

Coverage

• Operations (11/15 LENDING reasons end-to-end): SUPPLY, WITHDRAW, SUPPLY_COLLATERAL, WITHDRAW_COLLATERAL, BORROW, REPAY, CLAIM (pool + backstop source), LIQUIDATION (oracle-forced undercollateralization → new_auction → 50% fill; both counterparty rows + auction position folds), BACKSTOP_DEPOSIT, BACKSTOP_WITHDRAW_QUEUE, BACKSTOP_WITHDRAW_CANCEL.
• Read side: reserve rates/APYs vs mock-oracle prices, Comet LP valuation (backstop USD), oracle price snapshots (SEP-40 leg + Comet BLND/LP legs), emissions accrual and claims (claimedBlnd, backstopClaimedLp, token_id = -1 backstop streams), exact net_supplied/net_borrowed cost-basis folds, Q4W JSONB with the ~17-day expiration observed live over GraphQL while queued.
• Ingestion paths: BlendMigrationTestSuite runs protocol-setup → protocol-migrate current-state → protocol-migrate history (datastore backend, MinIO-fed by the ledger exporter) with cursor-handoff pre/post assertions — the history mode's first automated coverage. BlendLiveIngestionTestSuite restarts ingest with BLEND_PRICE_INTERVAL / BLEND_BACKSTOP_LP_CONTRACT_ID and asserts the full Freighter-facing GraphQL surface (blendPools, blendPool, blendEarnOptions, account.blendPositions, LENDING state changes).

Not covered end-to-end (unit tests only)

• BACKSTOP_WITHDRAW — the Q4W lockup is 17 days of wall-clock time; ARTIFICIALLY_ACCELERATE_TIME_FOR_TESTING only accelerates ledger cadence, not close time, so the lockup cannot elapse on standalone.
• FLASH_LOAN — needs a custom receiver contract.
• BAD_DEBT / DEFAULTED_DEBT — require draining the backstop below threshold plus a full liquidation leaving residual debt.

Production changes

• blndTokenAddress (internal/services/blend/validator.go) gains a standalone-network case: the suite issues BLND from the network master account (keypair.Root of the passphrase), so its SAC address is a fixed constant, letting pool-CLAIM rows carry the real BLND token_id on standalone. Pinned by a unit test and asserted at deploy time in the test setup.
• pkg/wbclient gains Blend query methods (GetBlendPools, GetBlendPool, GetBlendEarnOptions, GetAccountBlendPositions) and LendingChange state-change decoding, with unit tests.

Test infrastructure added

• Per-actor Soroban executor (executeSorobanOperationAs): arbitrary tx source, RPC-fresh sequences, simulation-provided auth nonces (the existing helper hardcodes nonce 0, safe only for the master account's first use).
• Salted contract deploys + address precompute, used to break the emitter↔backstop circular dependency by precomputing the backstop's address before deployment.
• Typed wrappers for every pool/backstop/emitter/oracle/Comet call, ScVal builders with symbol-sorted UDT maps (unit-tested), and named fixture constants so assertions reference the same values the operations used.

Blend phase adds ~100s to make integration-test (total run ~4.5 min, well under the 30m timeout). Verified green twice, including a FORCE_REBUILD=true from-scratch run.

🤖 Generated with Claude Code

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Update — assert claimed totals

Adds assertions that the supplier's pool claim and the whale's backstop claim fold positive totals into blend_pool_claimed / blend_backstop_claimed (via the new readers, after phase-2 ingestion), plus a guard that phase-1 (no claims) leaves both tables empty.