chore: align local-first control plane and editor fixes

- wire SQLite control-plane access/session paths into Rust web local-folder routes

- preserve local Markdown attachment semantics across upload, reload, and secondary-pane resource tabs

- refresh design governance docs, Reasonix task templates, and bug records

- retire root .mcp.json local MCP config

.agent-templates/task.md

@@ -0,0 +1,54 @@
+# Task: <title>
+
+## Metadata
+
+- Run ID: `<run-id>`
+- Lane: `<lane>`
+- Worker: `codex-<lane>`
+- Main repo: `/mnt/Data1T/mnote`
+- Worktree: `<absolute-worktree-path>`
+- Branch: `<branch-name>`
+- Result path: `<run-dir>/codex-<lane>/RESULT.md`
+
+## Goal
+
+Describe the concrete outcome expected from this worker.
+
+## Context
+
+- Relevant design docs:
+  - `...`
+- Relevant code paths:
+  - `...`
+
+## Allowed edit scope
+
+- `path/or/dir/**`
+
+## Forbidden scope
+
+- Do not edit files outside allowed scope.
+- Do not edit user data.
+- Do not modify unrelated recycle/history directories.
+- Do not commit, push, reset, or revert unless explicitly instructed.
+
+## Requirements
+
+- ...
+
+## Validation commands
+
+```bash
+# command 1
+# command 2
+```
+
+## Expected deliverable
+
+Write `RESULT.md` with:
+
+- completed work
+- modified files
+- validation commands and outputs
+- risks / unfinished items
+- suggested smoke scope