fix(deps): update langchain-core to v1.5.0

[stranske]

Supersedes stale Renovate #2802 from current main. Updates the LangChain core constraint and its requirements surfaces together.\n\nValidation: python3.12 -m pytest -o addopts= tests/workflows/test_reusable_ci_workflow.py (11 passed); git diff --check.

Summary by CodeRabbit

• Chores
  • Updated underlying framework components to newer compatible versions.
  • No user-facing features, configuration changes, or behavioral changes are included in this release.

[cursor]

Bugbot is not enabled for your account, so this pull request was not reviewed.

Enable Bugbot in the Cursor dashboard to get automatic reviews on future PRs.

[agents-workflows-bot]

Workflow source needed

PR #2844 needs either a linked GitHub issue or one valid non-issue Workflow Source before PR metadata automation can manage it safely.

Please do one of:

• Add <!-- meta:issue:123 --> or a normal Closes #123 / Related to #123 line.
• Check one Workflow Source option in the PR body.
• Add a hidden marker such as <!-- workflow-source:local_request -->, <!-- workflow-source:manual_remote -->, <!-- workflow-source:review_followup -->, <!-- workflow-source:sync_campaign -->, or <!-- workflow-source:dependabot -->.
• Add a workflow source label such as workflow:source-direct-pr, workflow:source-local-request, workflow:source-review-followup, workflow:source-sync, or workflow:no-automation.

Once a valid source is present, this warning will not be reposted.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: f0ccd019-a483-46ac-a91a-1fe663bbc4f8

📥 Commits

Reviewing files that changed from the base of the PR and between eaab0fe and d32581d.

⛔ Files ignored due to path filters (1)

• requirements.lock is excluded by !**/*.lock, !**/*.lock

📒 Files selected for processing (2)

• pyproject.toml
• requirements.txt

---

📝 Walkthrough

Walkthrough

LangChain Core dependency declarations are updated from the 1.4.x range to version 1.5.x in pyproject.toml and requirements.txt.

Changes

LangChain Core dependency update

Layer / File(s)	Summary
Update dependency constraints and pin pyproject.toml, requirements.txt	The optional dependency range changes to >=1.5,<1.6, and the requirements pin changes to 1.5.0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• stranske/Workflows#2463: Updates LangChain Core dependency pins from the 1.4.x range toward 1.5.x.
• stranske/Workflows#2506: Updates LangChain-related dependency pins in dependency files.

Suggested labels: dependencies

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the langchain-core dependency bump to v1.5.0.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/langchain-core-1-5-contract

---

_{Comment @coderabbitai help to get the list of available commands.}

[stranske]

Superseded by Renovate #2845, which contains the newer langchain-core 1.5.1 update together with compatible LangChain dependency updates on current main.

[agents-workflows-bot]

Automated Status Summary

Head SHA: 63cf088
Latest Runs: ⏳ pending — Gate
Required contexts: Gate / gate, Health 45 Agents Guard / guard
Required: core tests (3.12): ⏳ pending, core tests (3.13): ⏳ pending, docker smoke: ⏳ pending, gate: ⏳ pending

Workflow / Job	Result	Logs
(no jobs reported)	⏳ pending	—

Coverage Overview

• Coverage history entries: 1

Coverage Trend

Metric	Value
Current	75.90%
Baseline	85.00%
Delta	-9.10%
Minimum	70.00%
Status	✅ Pass

Top Coverage Hotspots (lowest coverage)

File	Coverage	Missing
scripts/issue_dedup_smoke.py	0.0%	4
scripts/runner_lib/__main__.py	0.0%	3
scripts/validate_template_sync.py	0.0%	81
scripts/langchain/topic_splitter.py	19.1%	57
tools/codex_log_analyzer.py	19.6%	140
scripts/repo_review_round2_runner.py	25.1%	344
scripts/prune_agent_stubs.py	39.7%	26
scripts/repo_review_round1_runner.py	40.7%	133
tools/ensure_workflow_timeout_variables.py	42.1%	74
scripts/sync_label_docs.py	42.9%	64
tools/discover_model_catalog.py	44.8%	55
scripts/repo_review_backlog_scan.py	45.3%	116
scripts/repo_review_body_writer.py	46.5%	86
tools/codex_session_analyzer.py	47.9%	59
scripts/create_verifier_labels.py	48.3%	58

Low Coverage Files (<50.0%)

File	Coverage	Missing
scripts/issue_dedup_smoke.py	0.0%	4
scripts/runner_lib/__main__.py	0.0%	3
scripts/validate_template_sync.py	0.0%	81
scripts/langchain/topic_splitter.py	19.1%	57
tools/codex_log_analyzer.py	19.6%	140
scripts/repo_review_round2_runner.py	25.1%	344
scripts/prune_agent_stubs.py	39.7%	26
scripts/repo_review_round1_runner.py	40.7%	133
tools/ensure_workflow_timeout_variables.py	42.1%	74
scripts/sync_label_docs.py	42.9%	64
tools/discover_model_catalog.py	44.8%	55
scripts/repo_review_backlog_scan.py	45.3%	116
scripts/repo_review_body_writer.py	46.5%	86
tools/codex_session_analyzer.py	47.9%	59
scripts/create_verifier_labels.py	48.3%	58

Updated automatically; will refresh on subsequent CI/Docker completions.

---

Keepalive checklist

Scope

No scope information available

Tasks

• No tasks defined

Acceptance criteria

• No acceptance criteria defined