chore(main): release 0.40.0

[ocervell]

🤖 I have created a release beep boop

0.40.0 (2026-07-06)

Features

• celery: cap worker-loss redeliveries to abandon repeatedly-killed tasks (#1284) (9de0592)
• hooks: on_build — stable runner identity across redeliveries (L2) (#1202) (e0b16b4)
• runners: redact sensitive task options from serialized/printed state (#1232) (0203f02)
• vulnerability: add status field + carry-over across re-scans (#1240) (60154dd)

Performance Improvements

• runners: route empty-results mark_started to the small pool (#1281) (56866d6)

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This PR was generated with Release Please. See documentation.

[coderabbitai]

Walkthrough

This PR adds a changelog entry for version 0.40.0, describing a hooks-related feature change to on_build providing stable runner identity across redeliveries, and bumps the project version in pyproject.toml from 0.39.0 to 0.40.0.

Changes

Release version bump

Layer / File(s)	Summary
Changelog and version update CHANGELOG.md, pyproject.toml	Adds 0.40.0 release entry noting on_build stable runner identity across redeliveries, and bumps the project version to 0.40.0.

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

Poem

A hop, a skip, a version raised,
0.40.0, the changelog praised,
Runner IDs now stand so still,
Even when redeliveries spill,
Carrot in paw, I approve this bump! 🥕

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the release to version 0.40.0.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-please--branches--main

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[ocervell]

🤖 Created releases:

• v0.40.0

🌻