release: 25.15.1

[HyeockJinKim]

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue
• Installer updates including:
  • Fixtures for db schema changes
  • New mandatory config options
• Update of end-to-end CLI integration tests in ai.backend.test
• API server-client counterparts (e.g., manager API -> client SDK)
• Test case(s) to:
  • Demonstrate the difference of before/after
  • Demonstrate the flow of abstract/conceptual models with a concrete implementation
• Documentation
  • Contents in the docs directory
  • docstrings in public interfaces and type annotations
    …kernel` (fix(BA-2656): Raise correct exception in SessionTransitionData.main_kernel #6202) (fix(BA-2656): Raise correct exception in SessionTransitionData.main_kernel (#6202) #6204)

Co-authored-by: Gyubong Lee gbl@lablup.com

[Copilot]

Pull Request Overview

This is a release preparation PR for version 25.15.1, which consolidates changelog entries from individual change files into the main CHANGELOG.md. The release includes one new feature allowing customizable container commit timeout and multiple bug fixes addressing session management, storage proxy permissions, and performance improvements.

• Bumped version from 25.15.0 to 25.15.1
• Consolidated 11 changelog entries into CHANGELOG.md
• Added commit-timeout configuration option to agent sample config

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
VERSION	Version bumped to 25.15.1
CHANGELOG.md	Added release 25.15.1 section with consolidated changelog entries
configs/agent/sample.toml	Added commit-timeout configuration option
changes/*.fix.md	Removed individual changelog files (consolidated into CHANGELOG.md)
changes/6346.feature.md	Removed individual changelog file (consolidated into CHANGELOG.md)

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