generalize presets into mosaic profiles with runtime overlays

profiles/README.md

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+# Mosaic Profiles
+
+Profiles are runtime-neutral context packs that can be consumed by any agent runtime.
+
+## Layout
+
+- `domains/`: regulated-domain and security context (HIPAA, fintech, crypto, etc.)
+- `tech-stacks/`: stack-specific conventions and quality checks
+- `workflows/`: reusable execution workflows
+
+## Runtime Split
+
+- Runtime-neutral content belongs here under `~/.mosaic/profiles`.
+- Runtime-specific settings belong under `~/.mosaic/runtime/<runtime>/...`.
+
+Current runtime overlay example:
+
+- `~/.mosaic/runtime/claude/settings-overlays/jarvis-ralph.json`
+
+## Claude Compatibility
+
+`mosaic-link-runtime-assets` links these into `~/.claude/presets/*` so existing Claude flows keep working while `~/.mosaic` remains canonical.