LCORE-1197: Update version to 0.4.0

[tisnik]

Description

LCORE-1197: Update version to 0.4.0

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up service version
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change
• Unit tests improvement
• Integration tests improvement
• End to end tests improvement

Tools used to create PR

• Assisted-by: N/A
• Generated by: N/A

Related Tickets & Documents

• Related Issue #LCORE-1197

Summary by CodeRabbit

Release Notes

• Documentation

  • API documentation updated to version 0.4.0

• API Schema Updates

  • tool_calls field is now guaranteed to be an array (previously could return null)
  • tool_results field is now guaranteed to be an array (previously could return null)

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[coderabbitai]

Walkthrough

This PR performs a version bump from 0.3.1 to 0.4.0 across the codebase. The changes include updating version strings in source code, API documentation, and test expectations. Additionally, the QueryResponse schema in the OpenAPI specification has been refined to remove nullable options for tool_calls and tool_results fields.

Changes

Cohort / File(s)	Summary
Version updates README.md, src/version.py	Version string bumped from 0.3.1 to 0.4.0
OpenAPI specification docs/openapi.json	API version updated to 0.4.0; QueryResponse schema refined to remove nullable options from tool_calls and tool_results fields, now always arrays
API documentation docs/openapi.md	Documentation for QueryResponse model updated to reflect tool_calls and tool_results as array types
End-to-end tests tests/e2e/features/info.feature	Test expectation for info endpoint version updated from 0.3.1 to 0.4.0

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• LCORE-1064: updated version in sources #881: Performs the same version-bump pattern, updating README badge, docs/openapi.json version, src/version.py version, and related tests.
• LCORE-803: Bump-up LCORE to 0.3.0 #653: Related release/version bump that touches the same version constant and OpenAPI info fields.
• LCORE-544: Bump-up to version 0.2.0 #435: Related version bump affecting README badge, docs/openapi.json info.version, and src/version.py.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: updating the service version from 0.3.1 to 0.4.0, which is consistently reflected across all modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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