chore(deps): update dependency langchain-core to v1.5.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
langchain-core (changelog)	==1.5.2 → ==1.5.3

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Workflow source needed

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Automated Status Summary

Head SHA: 1da5297
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

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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

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