docs: README 更新到 v1.2.0，并纠正已在 v1.2.0 删除的机制

README 的「项目状态」停在 **v1.1.1**，而且其中两条描述与当前实现**相反**：
「媒体以 `[<mime> <短digest>] <描述>` 标记存在于纯文本记忆中，描述是可检索的
语义记忆」与「引用计数式 GC（有引用者绝不删）」——这两套机制正是 v1.2.0 拆掉的。

本次不重写历史条目（它们记录了演进），而是：

1. 「项目状态」顶部新增 **v1.2.0** 条目：统一多模态向量空间（模型中立 SPI +
   Chinese-CLIP 默认，含「纯文本语义弱于 MLLM 型嵌入器」这一已知代价）、
   媒体升为图记忆一等节点（并写明具体删掉了什么）、数据面全量走共享内存
   （协议 2、不支持滚动升级）、注入标志位、发行包默认启用 ONNX 且随包模型、
   homed 改走 WSL2、以及三个安装链静默失败的修复。
2. 在 v1.2.0 条目后加一条显式提示：下方历史条目中的「描述式索引」与
   「媒体引用计数式 GC」**已在 v1.2.0 移除**——避免读者按旧文档理解现行行为。
3. 「下载」：Windows 安装器的版本号改到 v1.2.0，并写明自 v1.2.0 起因 homed
   不再支持 Windows 原生，安装器改为引导到 WSL2 并在其中按 Linux 方式安装；
   同时注明安装器含 AGPL 许可页。

中英双份同步。SDK 仓 README 另在 SDK 仓提交（d893bfa）。

README_EN.md

@@ -184,6 +184,40 @@ External plugin development: see [homeagent-sdk](https://gitcode.com/JianFeeeee/
 
 ## Project Status
 
+**v1.2.0** — unified multimodal vector space, media promoted to first-class graph memory, and the whole data plane moved into shared memory.
+
+- **Model-neutral unified embedding space**: the kernel no longer adapts to any specific model.
+  It exposes only a public provider SPI (`pkg/embedding`: `Modality` / `Input{Data,MIME}` /
+  `Info{Dimension,Fingerprint,Modalities}` + a name registry), with implementations under
+  `providers/*`. Default: **Chinese-CLIP ViT-B/16** — text and image land in the **same space**
+  (512-dim, fingerprint `cd2a495cf990`, Apache-2.0, ~1.15GB RSS measured standalone);
+  `qwen3vl` is kept (2048-dim, ~9.4GB) for machines with headroom or future video. Text search
+  still falls back to the existing word-vector / TF-IDF path — a CLIP dual tower's pure-text
+  semantics are **weaker than an MLLM-style embedder**, a cost documented rather than hidden.
+- **Media are first-class nodes and edges in the graph DB**: the "index images via generated
+  text descriptions" stopgap, `media_refs` and media reference counting are **removed**.
+  Memory blocks follow a single-layer invariant — Context → Document → Graph is a **migration**,
+  not a copy, and not kept alive by references.
+- **The entire data plane goes through shared memory** (tool-call frames, Cleaners, input/output
+  lanes, media blocks, document and knowledge bodies); RPC carries only offset descriptors.
+  **RPC protocol is now 2**: the fd3 layout changed and there is **no rolling upgrade** —
+  kernel and all plugins must be rebuilt and installed together.
+- Injections can declare `InjectOptions{NoMemory, ContextPolicy}` (**defaults: still recorded,
+  not pruned**); pruning must be requested explicitly and goes through the plugin's registered
+  `Cleaner`. SDK 1.2.0 is **purely additive** over 1.1.0.
+- **Release packages enable the ONNX space by default** and bundle the model (754MB) plus
+  ONNX Runtime (24MB) in the server/full packages; `homed` drops native Windows support in
+  favour of WSL2; the jieba dictionary is embedded in the binary.
+- Fixed three **silent install-chain failures**: `initconfig` was a no-op (`CGO_ENABLED=0` stub)
+  that printed credentials without writing any, fresh installs were misdetected as "already
+  configured" so default seeding was skipped entirely (0 plugins installed), and the deb
+  `postinst` looked for the unit in the wrong path so `enable` never ran.
+- Licensed **AGPL-3.0-only** from this version on (network clause included; statically linked
+  plugins must match — see License).
+
+> The historical entries below are kept verbatim to show the evolution; two mechanisms in them
+> were **removed in v1.2.0**: text-description-based media indexing, and reference-counted media GC.
+
 **v1.1.1** — Multimodal reaches the **plugin boundary**. v1.1.0 gave the memory system binary
 multimedia nodes, but that path was open only to the kernel itself; this release opens it to
 plugins and the model. The public SDK gains media fields and three media injection methods
@@ -231,7 +265,7 @@ semantic memory; the blob is only a cache that capacity GC may evict.
 | **client** | waiter + desktop GUI | Connecting to a remote HomeAgent |
 
 - Linux: `.deb` (amd64/arm64), `.rpm` (x86_64), `.tar.gz`
-- Windows: `HomeAgent_v1.1.1_{Full,Server,Client}_win64.exe` (NSIS installer)
+- Windows: `HomeAgent_v1.2.0_{Full,Server,Client}_win64.exe` (NSIS installer, includes the AGPL license page). Since v1.2.0 `homed` no longer supports native Windows (it relies on fd inheritance and in-segment offset dereferencing), so the installer bootstraps **WSL2** and installs the Linux packages inside the distribution the same way a Linux host would.
 - Portable: `homeagent-bin-<os>_<arch>.tar.gz` (homed/waiter/initconfig)
 - Verification: `SHA256SUMS`