fix(tests): correct BSV magic bytes and add splitter propagation guards

[martyncharler]

Summary

Remediations for the 2026-05-28 NO_GO acceptance run (see issue #7). All changes are in the test harness — no production code is touched.

• PC-3 (FAIL): parseStandardBlock was matching standard Bitcoin wire magic bytes instead of BSV-specific LE wire bytes, so the P2P frame preamble was never detected and block parsing failed.
• INTER-2 (SKIPPED 0/33) / PERF-1 (ERROR): Splitter tx submitted to Teranode was not propagating to svnode-1 (teranode#942). The mined block was empty, the splitter was evicted, and all test txs spending its outputs were rejected. Now skips early with a clear teranode#942 reference instead of a cryptic submission failure.
• INTER-1 (reorg phase): B2 propagation timeout raised 30s→60s; reorg convergence timeout raised 60s→120s. Teranode has been observed slow to finalise reorgs under regtest; the old budgets were too tight.

Changes

File	Change
tests/pc3.go	Fix magic bytes in parseStandardBlock to use BSV LE wire values from p2p_probe.go
tests/inter2.go	Add 15s splitter propagation guard on svnode-1 before mining
tests/perf1.go	Same guard at each rate step
tests/helper.go	Extend B2 propagation and reorg convergence timeouts in induceReorg

What still requires upstream fixes in Teranode

Test	Upstream issue
CLIENT-1, CLIENT-3	Centrifuge transport Unidirectional=true in services/asset/centrifuge_impl/websocket.go
INTER-1 (root cause), INTER-2, PERF-1	teranode#942 — outbound legacy P2P not broadcasting txs/blocks to SV peers

Test plan

• Run acceptance suite in SHORT mode after merging; PC-3 should now PASS
• INTER-2 and PERF-1 should SKIP with a clean teranode#942 message (not ERROR/cryptic fail) until teranode#942 is fixed upstream
• INTER-1 reorg phase should have more headroom; confirm it does not timeout on a healthy network

Closes part of #7.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Test harness fixes for the 2026-05-28 NO_GO acceptance run: corrects the PC-3 BSV wire magic byte detection, adds early SKIP guards in INTER-2/PERF-1 when the splitter tx fails to propagate to svnode-1 (teranode#942), and widens reorg-related timeouts in induceReorg. No production code is touched.

Changes:

• Replace BTC mainnet/testnet magic bytes in parseStandardBlock with the BSV-specific little-endian wire values (mainnet/regtest/testnet/teratestnet) that match internal/teranode/p2p_probe.go.
• Add a 15s waitForMempoolEntries guard on svnode-1 in both RunINTER2 and each rate step of RunPERF1, converting a cryptic downstream failure into a clean SKIP referencing teranode#942.
• Raise B2 propagation timeout 30s→60s and reorg convergence 60s→120s in induceReorg, with clearer error messages.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/pc3.go	Switch wire-frame detection to BSV LE magic bytes (mainnet e3 e1 f3 e8, regtest da b5 bf fa, testnet f4 e5 f3 f4, teratestnet 0d 01 09 0c).
tests/inter2.go	Pre-mine SKIP if splitter tx not seen in svnode-1 mempool within 15s.
tests/perf1.go	Same splitter propagation guard applied at every rate step.
tests/helper.go	Extend induceReorg timeouts (B2 propagation 60s, reorg convergence 120s) with descriptive error messages.

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