chore(release): v16.1.0

[dyoshikawa]

Release v16.1.0.

Summary

• Antigravity file-based custom agents (subagents) + CLI permissions keys (feat(antigravity): emit file-based custom agents, add the CLI artifact-review/workspace-access knobs #2465)
• Cursor Bugbot checks surface (.cursor/BUGBOT.md) (feat(cursor): generate Bugbot code review instructions from checks #2469)
• Codex CLI SessionEnd hook, Windows command override, MCP env_vars entries (feat(codexcli): follow the SessionEnd hook, Windows command override, and MCP environment targeting #2470)
• Claude Code DirectoryAdded event, hook handler fields, skill background, sandbox settings, matching permission rule forms (feat(claudecode): follow the DirectoryAdded event, documented hook handler fields, and skill background #2471, feat(claudecode): emit permission path rules in the forms Claude Code matches, and make sandbox authorable #2472)
• Copilot CLI userPromptTransformed, matcher-aware events, portable hook fields, skill invocation flags (fix(copilotcli): map userPromptTransformed, honor every documented matcher event, read portable hook fields and skill invocation flags #2466)
• Copilot (VS Code) edits/urls approvals, JSONC mcp.json handling, user-scope hooks file (fix(copilot): map edits/urls approvals, stop clobbering mcp.json inputs/sandbox, add the user-scope hooks file #2467)
• OpenCode legacy MCP toggles, four more plugin events, skills.paths import (fix(opencode): accept legacy MCP toggles, map four more plugin events, read skills.paths on import #2468)
• Build provenance verification docs (docs: add build provenance verification to the installation guide #2473)

🤖 Generated with Claude Code

[dyoshikawa]

@dyoshikawa Thank you!