migrate mosaic home to xdg config path

STANDARDS.md

@@ -3,7 +3,7 @@
 This file is the canonical standards contract for agent sessions on this machine.
 
 Master/slave model:
-- Master: `~/.mosaic` (this framework)
+- Master: `~/.config/mosaic` (this framework)
 - Slave: each repo bootstrapped via `mosaic-bootstrap-repo`
 
 ## Execution Model
@@ -12,16 +12,16 @@ Master/slave model:
 2. Load project-local `AGENTS.md` next.
 3. Respect repository-specific tooling and workflows.
 4. Use lifecycle scripts when available (`scripts/agent/*.sh`).
-5. Use shared rails/guides from `~/.mosaic` as canonical references.
+5. Use shared rails/guides from `~/.config/mosaic` as canonical references.
 
 ## Non-Negotiables
 
 - Data files are authoritative; generated views are derived artifacts.
 - Pull before edits when collaborating in shared repos.
 - Run validation checks before claiming completion.
-- Apply quality rails from `~/.mosaic/rails/` when relevant (review, QA, git workflow).
-- For project-level mechanical enforcement templates, use `~/.mosaic/rails/quality/` via `~/.mosaic/bin/mosaic-quality-apply`.
-- For runtime-agnostic delegation/orchestration, use `~/.mosaic/rails/orchestrator-matrix/` with repo-local `.mosaic/orchestrator/` state.
+- Apply quality rails from `~/.config/mosaic/rails/` when relevant (review, QA, git workflow).
+- For project-level mechanical enforcement templates, use `~/.config/mosaic/rails/quality/` via `~/.config/mosaic/bin/mosaic-quality-apply`.
+- For runtime-agnostic delegation/orchestration, use `~/.config/mosaic/rails/orchestrator-matrix/` with repo-local `.mosaic/orchestrator/` state.
 - Avoid hardcoded secrets and token leakage in remotes/commits.
 - Do not perform destructive git/file actions without explicit instruction.
 
@@ -44,15 +44,15 @@ If a repo does not expose these scripts, run equivalent local workflow commands
 
 All runtime adapters should inject:
 
-- `~/.mosaic/STANDARDS.md`
+- `~/.config/mosaic/STANDARDS.md`
 - project `AGENTS.md`
 
 before task execution.
 
 Runtime-compatible guides and rails are hosted at:
 
-- `~/.mosaic/guides/`
-- `~/.mosaic/rails/`
-- `~/.mosaic/profiles/` (runtime-neutral domain/workflow/stack presets)
-- `~/.mosaic/runtime/` (runtime-specific overlays)
-- `~/.mosaic/skills-local/` (local private skills shared across runtimes)
+- `~/.config/mosaic/guides/`
+- `~/.config/mosaic/rails/`
+- `~/.config/mosaic/profiles/` (runtime-neutral domain/workflow/stack presets)
+- `~/.config/mosaic/runtime/` (runtime-specific overlays)
+- `~/.config/mosaic/skills-local/` (local private skills shared across runtimes)