chore(deps): Bump langgraph from 1.0.2 to 1.2.1 in /a2a/file_organizer

[dependabot]

Bumps langgraph from 1.0.2 to 1.2.1.

Release notes

Sourced from langgraph's releases.

langgraph==1.2.1

Changes since 1.2.0

• release(langgraph): 1.2.1 (#7883)
• feat(langgraph): add before_builtins opt-in for stream transformers (#7882)
• chore(deps): bump idna from 3.11 to 3.15 in /libs/langgraph (#7866)
• fix(langgraph): keep tool results out of v3 messages (#7838)
• chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/langgraph (#7788)

langgraph==1.2.0

Changes since 1.2.0a7

• release: bump alpha packages to official versions (#7775)
• feat(langgraph): durable error-handler resume across host crashes (#7773)
• feat(langgraph): add set_node_defaults() to StateGraph (#7747)
• chore(deps): bump urllib3 from 2.6.3 to 2.7.0 in /libs/langgraph (#7766)
• chore(deps): bump mistune from 3.2.0 to 3.2.1 in /libs/langgraph (#7733)
• chore(langgraph): bump langchain-core to 1.4.0 (#7767)
• feat(checkpoint): force delta channel snapshot after max supersteps since last snapshot (#7746)
• test(langgraph): de-flake heartbeat progress test (#7735)
• chore(langgraph): re-implement exit mode for delta channel (#7730)
• chore(deps): bump ty from 0.0.23 to 0.0.33 in /libs/sdk-py (#7666)
• docs(checkpoint): mark DeltaChannel and delta-history APIs as beta (#7732)
• chore(deps): bump jupyter-server from 2.17.0 to 2.18.0 in /libs/langgraph (#7713)
• feat(checkpoint-sqlite): override get_delta_channel_history with streaming walk (#7702)
• chore: "chore: minor clean up around checkpoint and delta channel" (#7706)
• chore: minor clean up around checkpoint and delta channel (#7705)

langgraph==1.2.0a7

Changes since 1.2.0a6

• release: alpha bump (a4) for langgraph, checkpoint, checkpoint-postgres (#7701)
• feat: public get_writes_history saver API + delta cadence rework (#7699)

langgraph==1.2.0a6

langgraph v1.2 (alpha)

This release adds finer-grained control over node execution — timeouts, error recovery, and graceful shutdown — a new channel type that cuts checkpoint overhead for long-running threads, and a new content-block-centric streaming API (v3) with typed, per-channel projections.

---

DeltaChannel (beta)

A new channel type that stores only the incremental delta at each step rather than re-serializing the full accumulated value. Most useful for channels that grow large over time — for example, a message list in a long-running thread. Without it, the full message list is written into every checkpoint; with DeltaChannel, only the new messages from each step are stored.

Use snapshot_frequency=K to write a full snapshot every K steps and bound read latency:

from typing import Annotated, Sequence
from typing_extensions import TypedDict
</tr></table> 

... (truncated)

Commits

• bf7fec0 release(langgraph): 1.2.1 (#7883)
• 8215a9d feat(langgraph): add before_builtins opt-in for stream transformers (#7882)
• aa322c1 chore(deps): bump langsmith from 0.7.31 to 0.8.0 in /libs/checkpoint-sqlite (...
• d631912 chore(deps): bump idna from 3.11 to 3.15 in /libs/prebuilt (#7864)
• 9b0864a chore(deps): bump idna from 3.11 to 3.15 in /libs/checkpoint-sqlite (#7862)
• e68726d chore(deps): bump turbo from 2.9.7 to 2.9.14 in /libs/cli/js-monorepo-example...
• a459020 chore(deps): bump idna from 3.11 to 3.15 in /libs/langgraph (#7866)
• 5d3f11e chore(deps): bump idna from 3.11 to 3.15 in /libs/sdk-py (#7863)
• 37dc5c1 chore(deps): bump idna from 3.13 to 3.15 in /libs/checkpoint-conformance (#7867)
• ea44df3 fix(langgraph): keep tool results out of v3 messages (#7838)
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