bch(M5): handshake-gated auto-getheaders kick — embedded header-sync self-start - #240
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…self-start The verack handler now self-issues the initial getheaders from the HeaderChain back-off locator when armed, so the embedded P2P node drives IBD without an external getheaders poll. Production run() arms it in maybe_start_p2p() (gated on a configured peer); the no-peer/RPC-only contract and the BCHN-RPC fallback are untouched. Off by default so the --ibd evidence harness and manual-drive tests keep prior behaviour. Adds --auto-kick to the --ibd harness: arms the self-start and skips the manual ibd_kick_sync poll. Live VM300 .110:8333 read-only proof — handshake -> AUTO getheaders self-started, synced 955700->956034 (peer tip, advanced), in_flight drained 0, false_evict=0, reissue=0, ABLA cursor 955700->956034. p2pool-merged-v36 surface: NONE (local SPV wire-sync transport only).
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Summary
The embedded BCH P2P node now self-starts header sync at handshake. The verack handler self-issues the initial getheaders from the HeaderChain back-off locator when armed, so production run() drives IBD without an external getheaders poll.
Off by default: the --ibd evidence harness and manual-drive tests keep prior behaviour; no-peer/RPC-only contract and the BCHN-RPC fallback are untouched.
Verification
Scope
p2pool-merged-v36 surface: NONE (local SPV wire-sync transport only). src/impl/bch + harness only. VM300 read-only (P2P connect issues no qm op). Merge operator-gated.