chore(release): prepare 0.51.0

[elkaix]

Summary

• Bump version to 0.51.0 (pyproject.toml, uv.lock)
• Ship TUI/update fixes since v0.50.0: model-aware thinking levels, diff-card tint rendering, VS Code truecolor detection, suppressed reload welcome banner, footer update notice placement, safer Homebrew self-upgrades
• Update changelog, README "What's New", getting-started, linux-installer docs, and breaking-changes entry

Test plan

• scripts/check_version_tag.py --expected-version 0.51.0
• README/CHANGELOG version grep checks
• scripts/check_pythinker_dependency_versions.py
• pytest tests/test_installation_docs.py tests/test_homebrew_formula.py
• make build-web (local UI bundle refresh)
• CI required checks green
• Squash-merge, then tag v0.51.0 after confirmation

Summary by CodeRabbit

• Documentation

  • Updated installation guides and changelog for version 0.51.0 with upgrade instructions for Windows, Linux, and pip installations.

• Chores

  • Bumped project version to 0.51.0 across all distribution packages and build configurations.

[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: a8a7e31e-6231-4e02-94eb-cb44c76df4c9

📥 Commits

Reviewing files that changed from the base of the PR and between de0457f and f5ffced.

⛔ Files ignored due to path filters (4)

• docs/en/guides/getting-started.md is excluded by !docs/**
• docs/en/release-notes/breaking-changes.md is excluded by !docs/**
• docs/en/release-notes/changelog.md is excluded by !docs/**
• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• CHANGELOG.md
• README.md
• packages/linux-installer/README.md
• pyproject.toml

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📝 Walkthrough

Walkthrough

Version bump from 0.50.0 to 0.51.0: pyproject.toml version field updated, CHANGELOG.md gains a new 0.51.0 release entry, and all installer artifact filenames, download URLs, and checksum references in README.md and packages/linux-installer/README.md are updated accordingly.

Changes

v0.51.0 Release Prep

Layer / File(s)	Summary
Version field and CHANGELOG entry pyproject.toml, CHANGELOG.md	pyproject.toml version set to 0.51.0; CHANGELOG.md adds the 0.51.0 (2026-06-22) release header and upgrade/install instructions line.
README install/release reference updates README.md	What's New section, Windows installer table entry and manual-install commands, Linux package download URLs, and verify-before-install checksum commands all updated from 0.50.0 to 0.51.0.
Linux installer README updates packages/linux-installer/README.md	End-user Debian/RPM install shell commands and local build.sh invocation updated to v0.51.0 artifact filenames and URLs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Pythoughts-labs/pythinker-code#171: Same release-prep pattern — bumps pyproject.toml, CHANGELOG.md, README.md, and packages/linux-installer/README.md to a new version.
• Pythoughts-labs/pythinker-code#173: Identical mechanical release bump touching the same files and same versioned installer/package references.
• Pythoughts-labs/pythinker-code#147: Same set of files updated with the same version-bump pattern including checksum URLs and native installer filenames.

Suggested labels

documentation, dependencies

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'chore(release): prepare 0.51.0' follows conventional commit format with type 'chore', scope 'release', and a clear description of the release preparation.
Description check	✅ Passed	The PR description includes a summary of version changes, features shipped, documentation updates, and a comprehensive test plan, though it lacks the standard template structure with 'Related Issue' section and checklist items.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/0.51.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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