📦 chore: v3.4.0

[danny-avila]

Version bump → npm publish (publish.yml ships on merge since package.json will exceed npm's 3.3.4).

Since 3.3.4

• 🔪 feat: Cooperative Mid-Generation Stream Preemption #335 — 🔪 Cooperative mid-generation stream preemption (RunConfig.preemption, PreemptBoundary hook, seal gate, halt semantics, strict-alternation wire shaping). Opt-in: nothing activates without preemption configured; the shared-path changes (Bedrock converter user-run merging, steer anchor, coalescer) are live-verified on 8 providers.
• 🧵 fix: Break the Predecessor Prefill for Bare Direct-Edge Successors on Claude #346 — 🧵 Predecessor prefill handoff cue for bare direct-edge multi-agent successors on Claude (fixes Multi-agent direct edges send the successor a trailing-assistant prefill on Claude — empty or continuation-shaped successor turns #345).
• 🧪 fix: Transform ESM-Only Dependencies So Jest Can Load Them #343 — 🧪 Jest module mapping for ESM-only @langchain/mistralai.
• feat(search): add Keenable as a keyless content scraper #337, 🧭 fix: Normalize GraphInterrupt Langfuse Traces #348, 🧹 fix: Apply Every Delta Content Part; Remove Dead SplitStreamHandler #350 — Keenable scraper, Langfuse GraphInterrupt trace normalization, delta content-part fixes.

LibreChat consumes this via a follow-up ^3.4.0 bump PR on dev (prerequisite for the steering server PR).