Why: host integration step U6 — sync submodule pins so Backend 3f4b34a's expected deps (agent-intent=651a2e1 / agent-native=28f3ea7 / agent-squad=11ff3a0) match Dev pins. Evidence: scripts/check-pins.sh returns 'pins ok' after this commit; was failing on modules/backend deps/agent-intent is 651a2e1, Dev deps/agent-intent is 343b1e6d9a5b mismatch. Impact: ci/test test-pins gate passes; remaining gates (test-pg / svc-realcombo) require PostgreSQL+Redis services. Refs: PR #628.
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