change default of `installer.re-resolve` from `true` to `false`

[radoering]

Pull Request Check List

Resolves: #10617

• [ ] Added tests for changed code.
• [x] Updated documentation for changed code.

We have probably reached a point where installation without re-resolving is stable enough to make it the default. Making it the default may reveal new bugs but on the other side https://github.com/python-poetry/poetry/issues/10617#issuecomment-3522733697 shows that the old way has its own bugs.

Summary by Sourcery

Change the default behavior of the installer to disable re-resolving dependencies by default and update associated configuration, documentation, and tests.

Enhancements:

• Set installer.re-resolve default to false in configuration and installation logic

Documentation:

• Update documentation to reflect the new default and note the version change in configuration and dependency specification guides

Tests:

• Adjust console command tests to expect installer.re-resolve default as false

[sourcery-ai[bot]]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR inverts the default of installer.re-resolve to false by updating the Config default and installer logic, aligning tests to expect the new default, and adjusting documentation accordingly.

Class diagram for updated Config defaults

classDiagram
    class Config {
        +installer: dict
    }
    class Installer {
        -_config: Config
        +_do_install()
    }
    Config <|-- Installer
    Config : installer["re-resolve"] = False

Flow diagram for installer.re-resolve default logic

flowchart TD
    A["Start installation"] --> B["Read installer.re-resolve from config (default: false)"]
    B --> C{Is re-resolve true?}
    C -- Yes --> D["Perform re-resolve logic"]
    C -- No --> E["Skip re-resolve logic"]
    D --> F["Continue installation"]
    E --> F

File-Level Changes

Change	Details	Files
Change installer.re-resolve default in code	Set "re-resolve" default to false in Config class Use false fallback when reading installer.re-resolve in installer logic	src/poetry/config/config.py src/poetry/installation/installer.py
Update tests to expect new default	Replace expected installer.re-resolve value from true to false across tests	tests/console/commands/test_config.py
Adjust documentation for new default	Update default value description and add version note in configuration guide Revise dependency-specification warning to reflect default change in 2.3	docs/configuration.md docs/dependency-specification.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
https://github.com/python-poetry/poetry/issues/10617	Ensure that adding an unrelated package (cloud-sql-python-connector) does not change the version resolution of pytest-asyncio inappropriately.	✅
https://github.com/python-poetry/poetry/issues/10617	Ensure that pytest-asyncio 1.3.0 correctly includes the backports-asyncio-runner dependency in the lockfile when required (for Python <3.11).	✅

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