generalize runtime ownership with doctor and local skill migration

skills-local/mosaic-standards/SKILL.md

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+---
+name: mosaic-standards
+description: Load machine-wide Mosaic standards and enforce the repository lifecycle contract. Use at session start for any coding runtime (Codex, Claude, OpenCode, etc.).
+---
+
+# Mosaic Standards
+
+## Load Order
+
+1. `~/.mosaic/STANDARDS.md`
+2. Repository `AGENTS.md`
+3. Repo-local `.mosaic/repo-hooks.sh` when present
+
+## Session Lifecycle
+
+- Start: `scripts/agent/session-start.sh`
+- Priority scan: `scripts/agent/critical.sh`
+- End: `scripts/agent/session-end.sh`
+
+If wrappers are available, you may use:
+
+- `mosaic-session-start`
+- `mosaic-critical`
+- `mosaic-session-end`
+
+## Enforcement Rules
+
+- Treat `~/.mosaic` as canonical for shared guides, rails, profiles, and skills.
+- Do not edit generated project views directly when the repo defines canonical data sources.
+- Pull/rebase before edits in shared repositories.
+- Run project verification commands before claiming completion.
+- Use non-destructive git workflow unless explicitly instructed otherwise.