Ship direct desktop installer assets for 0.6.2

[trissim]

Outcome

OpenHCS desktop installation no longer requires ZIP extraction:

• Windows publishes one directly runnable OpenHCS-Windows-Installer.exe with the worker and release-pinned contract embedded.
• macOS publishes one OpenHCS-macOS-Installer.dmg containing the native universal installer app.
• Landing-page and documentation links point directly to those immutable asset names.
• Release and MCP metadata advance together to 0.6.2.

Verification

• OPENHCS_CPU_ONLY=true .venv/bin/python -m pytest -q -c tests/installer/pytest.ini tests/installer tests/unit/test_sync_mcp_release_metadata.py tests/unit/test_mcp_release_workflow.py tests/unit/test_release_helper.py tests/unit/test_build_website.py (59 passed)
• installer shell syntax validation
• workflow YAML safe-load validation
• scripts/sync_mcp_release_metadata.py --check --expected-version 0.6.2
• Ruff and git diff --check

Native CI additionally compiles and executes the embedded Windows EXE, and creates, verifies, mounts, and inspects the macOS DMG before running the installed-wheel/MCP/viewer smoke.

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Pull request overview

This PR updates the OpenHCS 0.6.2 release surfaces to ship direct desktop installer assets (Windows EXE + macOS DMG) without ZIP extraction, while keeping the website, docs, MCP metadata, and CI workflows aligned to the same release version.

Changes:

• Switch website/download UX from ZIP-based installers to direct OpenHCS-Windows-Installer.exe and OpenHCS-macOS-Installer.dmg assets.
• Update Windows installer launcher packaging to embed both the PowerShell worker and the rendered release-pinned contract into a single runnable EXE.
• Bump release version projections and MCP metadata from 0.6.1 → 0.6.2 and update publish/integration workflows to build/validate/upload the new asset formats.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
website/index.html	Updates landing page download links and helper text to point at EXE/DMG assets.
tests/unit/test_build_website.py	Tightens assertions to require exactly the EXE/DMG asset names and updated copy.
tests/installer/test_windows_simple_installer.py	Updates Windows installer expectations and adds a publish-workflow assertion for single-file release asset.
tests/installer/test_macos_simple_installer.py	Adds publish-workflow assertions for DMG creation/verification and removes ZIP assumptions.
server.json	Advances MCP registry metadata version and pinned openhcs[gui,mcp] requirement to 0.6.2.
packaging/mcpb/openhcs/pyproject.toml	Bumps MCPB runtime version and pinned dependency to 0.6.2.
packaging/mcpb/openhcs/manifest.json	Bumps MCPB manifest version to 0.6.2.
packaging/installers/windows/InstallerLauncher.csproj	Renames output assembly and embeds worker + contract as resources.
packaging/installers/windows/InstallerLauncher.cs	Extracts embedded resources to a temp directory, forwards CLI args to the worker, and returns the worker exit code.
packaging/installers/windows/Build-InstallerLauncher.ps1	Requires a rendered contract path and builds the single-file installer with embedded resources.
packaging/installers/README.md	Updates installer documentation to describe EXE/DMG assets and bumps example version to 0.6.2.
packaging/codex/openhcs/.mcp.json	Updates uvx --from openhcs[gui,mcp]==0.6.2 pin.
packaging/codex/openhcs/.codex-plugin/plugin.json	Bumps Codex plugin version to 0.6.2.
openhcs/__init__.py	Updates package __version__ to 0.6.2.
docs/source/guide_for_biologists/installation_and_setup.rst	Updates user-facing installation steps to reflect EXE/DMG flow (no ZIP extraction).
docs/source/development/mcp_release.rst	Updates release instructions and asset naming from ZIPs to EXE/DMG for 0.6.2.
.github/workflows/publish.yml	Builds/uploads EXE and DMG assets and attaches them to the GitHub Release alongside Python artifacts.
.github/workflows/integration-tests.yml	Updates Windows smoke to run the launcher EXE and adds macOS DMG creation/verification/mount checks.

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