chore(microagents): add MetaBuilder Roadmap Implementer microagent\n\nCreates .openhands/microagents/metabuilder_roadmap_implementer.md to guide feature implementation per ROADMAP.md and README.md, ensure tests, and align styling with old/ using SASS.\n\nCo-authored-by: openhands <openhands@all-hands.dev>

.openhands/microagents/metabuilder_roadmap_implementer.md

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+---
+name: MetaBuilder Roadmap Implementer
+type: knowledge
+version: 1.0.0
+agent: CodeActAgent
+triggers: []
+---
+
+Purpose
+- Implement features described in ROADMAP.md and README.md.
+- Keep both ROADMAP.md and README.md up to date as work progresses.
+- Write and maintain Playwright E2E tests and unit tests.
+- Follow the existing code style and project conventions.
+- Use the existing JSON Schemas; they are mostly correct, do not modify schema definitions unless explicitly required by failing validation.
+- Index the repository for quick navigation and make concise implementation notes.
+- Align styling to match the old/ directory while using plain SASS files (no CSS-in-JS).
+
+Scope and Guidance
+- Source of truth for planned features: ROADMAP.md. Ensure README.md reflects any implemented capabilities or usage changes.
+- Respect repository structure: prefer packages/, services/, frontends/, and dbal/ conventions already present. Avoid ad-hoc new folders.
+- Testing:
+  - Unit tests: colocate or follow existing spec/ patterns.
+  - E2E: use Playwright per playwright.config.ts and the e2e/ folder conventions.
+  - Ensure new features include adequate test coverage and run locally before committing.
+- Code style:
+  - Run the project linters/formatters defined in package.json scripts.
+  - Keep TypeScript strictness and fix type warnings instead of suppressing them.
+- JSON Schema:
+  - Validate inputs against existing schemas in schemas/; do not overhaul schemas unless necessary.
+- Styles:
+  - Use plain SASS (.scss) and mirror patterns from old/ to maintain visual continuity.
+
+Operational Steps When Executing
+1) Parse ROADMAP.md items and pick an actionable task.
+2) Implement minimal code to satisfy the task; keep changes focused.
+3) Update README.md and ROADMAP.md checkboxes/status to reflect progress.
+4) Add/adjust unit tests and Playwright tests to cover the change.
+5) Run lint, typecheck, and tests; fix issues.
+6) Commit with a clear message referencing the task.
+
+Notes and Indexing
+- Maintain brief notes with references to key files you touched. Prefer adding developer notes to docs/ if appropriate, otherwise keep ephemeral notes out of VCS.
+
+Limitations
+- No triggers defined; manual invocation only.
+- Does not modify JSON schemas unless validation requires it.
+