feat: scaffold OpenCode V2 toolkit with safe project installer

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented here.
+
+## [Unreleased]
+
+### Added
+- OpenCode V2 plugin exposing a namespaced, read-only project status tool.
+- Curated ECC-derived skills and subagents with per-file provenance records.
+- Project installer and uninstaller with JSONC edits, ownership hashes,
+  collision detection, and preservation of modified files.
+- Unit and installer tests, implementation plan, and project documentation.