Release v4.0.0

What's Changed

• ci: make dependency review non-blocking (requires repo-level dependency graph)
• ci: fix CI failures — add requirements.txt, update action SHAs
• ci: configure CI pipeline for Python 3.12 with lint, syntax check, and pytest
• chore(release): v4.0.0
• chore: add project config, workflows, icons, and utility scripts
• chore: bump plugin version to 4.0.0
• fix: resolve RLM model recommendations collision and restore export_context
• fix: resolve vector memory and MCP review findings
• fix: resolve memory subsystem review findings
• fix: resolve skill definition review findings
• fix: resolve config, utility, and provider review findings
• fix: resolve RLM and ollama review findings
• fix: resolve task/docs/test manager review findings
• fix: add missing timeout parameter to FileLockBackend.init
• chore: bump plugin version to 4.0.0
• fix: resolve RLM model recommendations collision and restore export_context
• fix: resolve vector memory and MCP review findings
• fix: resolve memory subsystem review findings
• fix: resolve skill definition review findings
• fix: resolve config, utility, and provider review findings
• fix: resolve RLM and ollama review findings
• fix: resolve task/docs/test manager review findings

Full Changelog: v4.0.0-staging...v4.0.0