feat: embed workspace_version in config + drop welcome.py duplicate check

[Jammy2211]

Summary

Embed version.workspace_version: 2026.4.13.6 and a user-facing version.workspace_version_check: True override flag in config/general.yaml, so the new config-aware autoconf.workspace.check_version (PyAutoLabs/PyAutoConf#101, now called from every import autofit/autogalaxy/autolens) can resolve the workspace version from a canonical source that travels with the user's config directory. The version.txt legacy fallback continues to work.

Also drop the now-redundant check_version(<lib>.__version__) call from welcome.py — the libraries do the check on import, so calling it again from welcome.py was duplicate work that fired only when users explicitly ran welcome.py (which most don't after the first time).

Setting workspace_version_check: False is the recommended bypass for users on main-branch workspace clones, where main updates faster than library releases and mismatches are expected.

Scripts Changed

• config/general.yaml — add a version: block with workspace_version: 2026.4.13.6 and workspace_version_check: True
• welcome.py — remove the redundant from autoconf import check_version import and the check_version(<lib>.__version__) call (libraries now run the check on import via PyAutoFit/Galaxy/Lens __init__.py)

Upstream PR

• feat(workspace): config-aware version check with YAML bypass PyAutoConf#101 — config-aware check_version (core change)
• feat: check workspace version on import PyAutoFit#1241, feat: check workspace version on import PyAutoGalaxy#380, feat: check workspace version on import PyAutoLens#484 — call check_version on library import
• feat(release): embed workspace_version in config/general.yaml PyAutoBuild#70 — release pipeline writes the new YAML key; verify_workspace_versions.sh reads it

Test Plan

• python -c "import <lib>" from this workspace runs silently (no warning, no error — version key matches installed library)
• bash PyAutoBuild/verify_workspace_versions.sh reports this workspace as ok
• CI smoke tests pass

🤖 Generated with Claude Code