v0.3.52

What changed

• Added runtime-probe for installed Codex, Claude Code, and OpenCode runtime entry points.
• Codex probe now renders codex debug prompt-input, parses the model-visible skill list, and fails when Codex reports shortened skill descriptions.
• OpenCode probe creates a temporary project SKILL.md and verifies native discovery with opencode debug skill.
• Added self-test --include-runtime-probes so install checks can include real runtime probes.
• Updated runtime presets and docs for .agents/skills roots that can leak into Codex/OpenCode skill metadata.

Verification

• python -m pytest -q -> 130 passed
• python -m agent_skill_groups runtime-probe --runtime all --json -> ok
• python -m agent_skill_groups self-test --include-runtime-probes --json -> ok
• git diff --check -> no whitespace errors
• python -m build -> built wheel and sdist
• Fresh virtualenv install from local wheel, then python -m agent_skill_groups runtime-probe --runtime codex --json -> ok