Add Windows AI Flywheel bootstrap

[infoconex]

Summary

Refactors the Windows Python bootstrap to consume the published AI Flywheel Framework installer instead of duplicating framework installation logic, and adds an explicit choice between repository-owned editable source and a managed CLI.

Responsibility boundary

• The AI Flywheel Framework installer owns framework release acquisition, SHA-256 verification, archive safety, provenance, staging, atomic .flywheel publication, rollback, and refusal to overwrite.
• The Windows Python bootstrap owns framework compatibility detection, official-installer delegation when absent, Python prerequisite handling, CLI installation-mode selection, runtime setup, and health checks.
• The Python CLI validates and operates an installed framework. It does not install or upgrade framework artifacts.
• Hybrid managed-CLI extension discovery is not implemented in this PR.

Framework contract

• Framework version: 2026.08.08
• Framework installer commit: fe11b801b5dfeef812377a978558fd563b67fa9e
• Default compatible CLI source commit: 2d84294cbe9922ec907fe718e9dd06e9944e0ebc
• Public launcher bootstrap commit: 4f787819df1617d0a6b8435196e9c978cfbf1457

Installation modes

• Repository-owned source (recommended): seeds pyproject.toml, README, package source, tests, and project tasks under .flywheel/tools; creates an editable runtime under .flywheel/.runtime/python-cli; and preserves repository adaptations on repeat runs.
• Managed CLI: retains the versioned environment under %LOCALAPPDATA%\AI-Flywheel\environments and does not copy CLI source into the repository.
• Noninteractive setup requires -CliInstallMode Source|Managed. Initial source installation also requires -Apply.
• Existing untracked .flywheel/tools content is protected from overwrite.
• Selecting managed mode for a repository already marked as source-owned is rejected because hybrid operation is deferred.

Other changes

• Delegates absent-framework installation to the official published framework installer.
• Preserves a compatible framework without mutation.
• Stops on older, newer, malformed, inconsistent, legacy, or untracked frameworks.
• Adds reusable Python framework compatibility classification.
• Expands flywheel doctor with deterministic compatibility and repository-health output.
• Removes Python-owned framework install/upgrade and publication logic.
• Preserves repository locking and the no-onboarding guarantee.
• Updates documentation and deterministic regression coverage.

Validation

Validated against exact remote head dc51459fadda9d4939a8c5209d1d11cdeb9b5bc7:

• Ruff lint and formatting
• strict mypy
• 97 pytest tests
• 84.73% total coverage
• source distribution and wheel builds
• PowerShell parser and PSScriptAnalyzer
• public launcher regression tests
• Windows bootstrap mode, source-seeding, preservation, conflict, and archive-safety tests

No onboarding or lifecycle operation is started by bootstrap.