chore: prepare GoodBuddy 0.12.7 and Agent 0.11.21 releases

Set the approved Desktop and Agent versions and package the approved Chinese
and English notes without changing published release history. Keep OpenCode
pinned to 1.18.29 and require Desktop 0.12.7 before the new Agent package.

Align both feature lists and affected design documents with reference-image
editing, inherited expert work modes, preview boundaries, and remaining
release acceptance. Application navigation remains design-only. No LoongArch
preview is planned for this release; Agent publication remains non-Latest.

The first candidate full run exposed a browser test clicking Send before it
was enabled. Wait for startup readiness using the existing test convention;
production code is unchanged by this release-preparation commit.

Validation: final full suite 3597 passed, 0 failed, 61 skipped across 338 files.
Typecheck, lint, bilingual release-note validation, version consistency,
unchanged historical notes, whitespace and relative-link checks passed.
No additional real model calls, local production builds, pushes or tags.
Concurrent navigation, workbar and roadmap design edits are not included.

FEATURES.md

@@ -17,6 +17,12 @@ otherwise.
 
 - [x] **Cross-platform desktop application**: Supports Windows, macOS, and
   Linux release targets on `x64` and `arm64`.
+- [x] **Chinese hardware and operating-system coverage**: Standard Linux
+  packages target compatible x64 and arm64 environments, including UOS, Kylin,
+  Hygon, Zhaoxin, Kunpeng, and Phytium systems. This is not vendor certification.
+  LoongArch has a separate experimental loong64 preview outside standard
+  releases and automatic updates; no preview is planned for 0.12.7. See the
+  [preview boundaries](./docs/development/loongarch-preview-build.md).
 - [x] **Configurable global shortcut**: Enable, disable, or record an Electron
   accelerator under Platform Features / General. The default remains
   `CommandOrControl+Shift+Space`; if registration conflicts or saving fails,
@@ -59,6 +65,10 @@ otherwise.
 - [ ] **Project Agent Space** (planned): Unifies roles, knowledge, Skills/MCP,
   models, approval policy, budgets, and timeouts in a Project, with reusable
   templates.
+- [ ] **Application navigation and system-tool shortcuts** (design only):
+  Plans fixed system entries, configurable built-in application visibility,
+  and footer shortcuts into the existing workbar. These are not implemented
+  interface changes. See the [design](./docs/features/application-tool-navigation/README.md).
 - [ ] **Additional assistant workbar and execution-space capabilities**
   (planned): Builds on the current workbar and multiple terminals with
   supervision, unified Runtime monitoring, managed processes, safe static HTML
@@ -71,7 +81,10 @@ otherwise.
 ### Agent Runtimes and model connections
 
 - [x] **Direct model Runtime**: Supports question answering, knowledge
-  synthesis, controlled tool execution, and image generation.
+  synthesis, controlled tool execution, image generation, and reference-image
+  editing through providers supporting the OpenAI-compatible image-editing
+  endpoint. Editing sends attached images as multipart data and still requires
+  validated inline image output rather than fetching provider-returned URLs.
 - [x] **Direct model programming agent**: Local direct text models can run the
   platform Shell in Execute mode and delegate one level of programming
   Subagent work while inheriting the parent request's mode, model, workspace,
@@ -161,7 +174,7 @@ otherwise.
   failure, Agent `SIGKILL`/restart, and recovery from a reopened Desktop SQLite
   database. Successful tool START/END events appear exactly once, with no
   Prompt, provider, or tool replay observed. The current Agent source lock is
-  `0.11.20`, while the current Desktop release candidate is `0.12.6`; formal
+  `0.11.21`, while the current Desktop release candidate is `0.12.7`; formal
   publication status follows the separate Agent and Desktop
   release channels. Current macOS source has passed native package installation,
   detached lifecycle, Attach, real Ask/Execute, and cancellation of tools in
@@ -192,10 +205,12 @@ otherwise.
   capabilities, and prompt startup do not scan the full payload. See the
   [design](./docs/features/remote-host/environment-provisioning-technical-design.md).
 - [ ] **Real-Host acceptance for SSH Host environment provisioning**: The
-  source can use the current format-v1 package. GitHub, Beijing mirror, Linux
-  x64/arm64, cancellation, and offline GoodBuddy transfer validation remains.
-  This status does not mean the path is published or has completed real-Host
-  testing.
+  current source passed isolated Linux x64 package installation, Ask/Execute,
+  native subagent external writes, reconnection, and stop/bootstrap.
+  The complete Host-card acquisition matrix across GitHub, Beijing mirror,
+  Linux x64/arm64, cancellation, and offline GoodBuddy transfer remains.
+  Candidate CI/native packaging and system sleep/wake are not yet verified;
+  this partial development evidence does not imply publication.
 - [x] **DeepSeek Harness (preview)**: Uses the fixed GoodBuddy Host and an
   OpenAI-compatible model connection. It prefers an administrator-provided
   connection, otherwise follows the compatible default model or first
@@ -225,7 +240,9 @@ otherwise.
   Execute permission confirmations are handled automatically rather than
   waiting for another approval. See the [interaction boundaries](./docs/features/assistant-workbar/runtime-interactions.md).
 - [x] **Experts and Subagents**: Supports explicit experts, team analysis, and
-  up to three read-only experts running in parallel. Chat shows each
+  up to three experts running in parallel. Experts inherit the parent
+  Ask/Execute mode and can use enabled local direct-model tools; Ask remains
+  read-only. They are not remote OpenCode child sessions. Chat shows each
   expandable full expert response first and the main Agent's synthesis below,
   and persists both with the conversation.
 - [x] **OpenCode child progress and final results**: Child cards show ordered
@@ -327,10 +344,10 @@ otherwise.
   supervision across OpenCode, Continue, and DeepSeek Harness. Users select
   only Conversation or Task; Job/Run remains internal rather than becoming a
   tree or independent object.
-- [ ] **Executable Subagents** (planned): Explicit Execute delegation with
-  bounded nesting, parallelism, tokens, time, and tool permissions, aggregated
-  by Task in the workbar's fixed Runtime section with cancellation and audit
-  ownership.
+- [ ] **Advanced Subagent supervision** (planned): Task-level aggregation in
+  the workbar's fixed Runtime section, configurable nesting, parallelism,
+  budgets, and lifecycle controls. Basic expert-mode inheritance and
+  single-level direct-model programming delegation are already available.
 
 ### Skills, MCP, and knowledge