chore(deps): broad dependency modernization (explicit workflow)

[John Kennedy (jkennedyvz)]

Summary

This PR runs the explicitly invoked langster-modernize-all-dependencies-explicit workflow. It is a broad dependency modernization, not a routine narrow Dependabot patch.

• modernizes all 12 runtime/dev direct dependencies to their current stable releases
• updates build requirements to setuptools>=84.0.0 and wheel>=0.48.0
• regenerates the complete uv lockfile, including major upgrades for LangChain provider packages, Fireworks, mypy, ruff, and transitive SDK/runtime packages
• removes the temporary PyJWT constraint because langgraph-api==0.13.0 now directly requires pyjwt>=2.13.0
• applies compatibility formatting/type-annotation changes required by ruff 0.16.4 and modernizes the SPDX license declaration required by current setuptools

Scope and package roots

• package root: repository root (pyproject.toml, uv.lock)
• runtime: Python 3.11 and 3.12
• no new package sources or direct dependencies were introduced

Caps removed, changed, or retained

• removed: temporary transitive pyjwt>=2.12.0 constraint; upstream now enforces a newer safe minimum
• dependency maximum caps: none were present
• retained: requires-python = ">=3.11,<4.0" because Python 4 is outside the repository/runtime support matrix rather than a dependency compatibility cap

Major-version migrations and compatibility edits

• langchain-openai 1.1.14 → 1.6.0
• langchain-anthropic 1.4.6 → 1.6.1
• langchain-fireworks 1.1.0 → 1.6.0
• mypy 1.19.1 → 2.3.1
• compatibility edits are limited to ruff's modern union annotation and formatting changes

Validation

• uv lock --check
• uv sync --all-extras --dev
• uv run ruff check .
• uv run ruff format . --check
• uv run mypy --strict src/
• uv run pytest tests/unit_tests -q (3 passed on Python 3.12)
• Python 3.11 sync + unit tests + strict mypy (3 passed; mypy clean)
• uv run pytest --collect-only tests/integration_tests -q (1 collected)
• uv build (sdist and wheel built)

The live integration test was not executed locally because it requires repository API-key secrets; CI/scheduled integration coverage remains authoritative.

Review hotspots and rollback

• review the broad transitive changes from LangGraph API 0.10.0 → 0.13.0 and provider SDK major versions
• rollback is a single-commit revert of this PR; no data or schema migration is involved