chore(release): prepare 0.43.0

[elkaix]

Release 0.43.0. Version bump + CHANGELOG/docs consumed from ## Unreleased.

What's in this release

• Silent startup auto-updates, on by default. Managed/native installs check for and apply updates in the background at startup with a restart-to-apply notice instead of a blocking prompt. Opt out with auto_update = false or PYTHINKER_AUTO_UPDATE=0; the Windows binary-replacement path no longer escapes as an uncaught SystemExit.
• Redesigned tracing dashboard (pythinker vis): refreshed Statistics and Sessions surfaces, a new Usage page with a usage heatmap and metric cards, blue-accent treatment.
• Robust project-memory tooling: delimiter-aware capacity accounting with exact free-space reporting, a read-only Memory list action, a /memory capacity panel at ≥85%, and a confirmation gate that steers rule-/value-/file-like writes toward the authoritative file.
• Sharper agent guardrails: absence claims must be backed by a zero-hit scan; designer-skill MCP bridge; best_practices_always startup guidance; precise multi-edit validation errors.
• Quality of life: /recap on|off with <system-reminder>-stripped recaps; decluttered slash command menu with persistent footer + +N more; normal-color diff context; /login selector polish; scratch cleanup on exception exit; error/crash telemetry emitted at ERROR severity.

Breaking / behavior notes

• Startup auto-updates are now on by default — set auto_update = false or PYTHINKER_AUTO_UPDATE=0 to keep updates manual.

Gates (all green locally)

• check_version_tag.py → matches 0.43.0
• README markers (What's New in 0.43.0, pythinker-code==0.43.0)
• check_pythinker_dependency_versions.py → workspace versions match
• tests/test_installation_docs.py + tests/test_homebrew_formula.py → 17 passed

Scope: the canonical 8-file release set (pyproject, uv.lock, CHANGELOG + docs changelog/breaking-changes, README, getting-started, linux-installer README).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 13c57b26-3ac4-4190-a903-9452249ab8a5

📥 Commits

Reviewing files that changed from the base of the PR and between 1f25072 and 87ba215.

⛔ 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

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/0.43.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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