Changelog, dev startup, README, AgentHub 0.4.0, model catalog, and landing site (#7)

Branch-length batch covering tooling, the model layer, the Web App and the public
surfaces. Highlights:

- Changelog: a per-release `changelog/<version>/` tree, grouped by the surface each
  change touches, with a root CHANGELOG.md holding one line per release.
- Dev startup: `scripts/dev-prebuild.mjs` serializes the skills+core prebuild behind a
  lock and keeps `pnpm install` current; `pnpm dev` runs server+web together.
- AgentHub 0.3.3 -> 0.4.0: OmniMessage complete payloads carry one opaque `fidelity`
  object in place of item-level `signature`/`phase`, threaded verbatim through Trace,
  replay and resume; malformed classification adapted to the new error types.
- Model layer: a model is always referenced by an explicit `(provider, model_id)` pair.
  The provider is never inferred, guessed or defaulted -- both the catalog inference and
  the unique-match config resolution are gone, and CLI, SDK, server routes and
  run_subagent all require the complete pair. Catalog gains the Qwen Token Plan, Qwen
  Pay-As-You-Go and Fireworks AI gateways, plus an expanded OpenRouter group.
- Web App: catalog preset sync and per-group speed test on the Models page, positional
  slash commands, a markdown renderer, skill-library update reminders, and a vertically
  centred draft page whose upward menus size themselves to the room available.
- Public surfaces: restructured READMEs, the penguin.ooo landing site and blog, refreshed
  benchmark results for both suites, and the demo videos playing on the landing page.

Includes the fixes from a full review of the branch: 23 confirmed findings, among them a
provider-inference bug that could send one vendor's API key to another vendor's endpoint,
and an Escape handler that destroyed the composer's contents unrecoverably.

Verified on the branch head: pnpm test (1127 passing, 7 packages), pnpm typecheck and
pnpm format:check clean, Playwright e2e 14/14.

packages/docs/content/models.zh.md

@@ -11,6 +11,8 @@ description: 经 AgentHub 单一网关接入模型，以 (provider, model_id)
 
 模型身份永远是 `(provider, model_id)` 成对表示：`provider` 是配置分组名，`model_id` 是原样发给上游的请求 id。二者是两个独立字段，任何环节都不允许拼接成一个字符串。
 
+所有涉及模型的接口都要求完整的二元组：CLI、HTTP API 与 SDK 都会拒绝半个引用，而不会替你补全。provider 绝不由模型 id 推断，也没有缺省值——网关会以上游 id 转售厂商模型，猜出来的分组会把该条目的凭据发往无人指定的厂商。凡是模型引用本身可省略之处（`penguin run` / `chat`、创建 Session、定时任务），可选的是整对：两半都省略即使用 Project 默认模型。
+
 ## Project 模型表
 
 每个 Project 的可用模型记录在隐藏文件 `.project_config.toml` 中，由 CLI(`penguin config model add / default / list`，见 [CLI 参考](/cli))或 Web 界面维护，不手工编辑。`ModelEntry` 字段：
@@ -57,7 +59,10 @@ api_key = "sk-..."
 | --- | --- | --- |
 | deepseek | `DEEPSEEK_API_KEY` | 默认模型所在分组 |
 | openrouter | `OPENAI_API_KEY` | OpenAI 兼容网关，预置 base URL `https://openrouter.ai/api/v1` |
+| fireworks | `OPENAI_API_KEY` | Fireworks AI(OpenAI 兼容)，预置 base URL `https://api.fireworks.ai/inference/v1`；API 模型 id 形如 `accounts/fireworks/models/<slug>` |
 | siliconflow | `OPENAI_API_KEY` | OpenAI 兼容网关，预置 base URL `https://api.siliconflow.cn/v1` |
+| qwen-token-plan | `OPENAI_API_KEY` | Qwen Token Plan 订阅网关，预置 base URL `https://token-plan.cn-beijing.maas.aliyuncs.com/compatible-mode/v1`；定价取各模型页官方牌价(预览模型仅配额倍率促销、无牌价) |
+| qwen-pay-as-you-go | `OPENAI_API_KEY` | Qwen 按量付费(DashScope OpenAI 兼容端)，预置 base URL `https://dashscope.aliyuncs.com/compatible-mode/v1`；转售第三方模型保留厂商前缀 id(如 `kimi/kimi-k3`) |
 | google | `GEMINI_API_KEY` | |
 | anthropic | `ANTHROPIC_API_KEY` | |
 | openai | `OPENAI_API_KEY` | |
@@ -65,9 +70,9 @@ api_key = "sk-..."
 | moonshot | `MOONSHOT_API_KEY` | |
 | custom | `OPENAI_API_KEY` | 任意 OpenAI 协议端点 |
 
-网关分组(openrouter / siliconflow)经 AgentHub 的 OpenAI 客户端请求，因此凭证留空时读取的是 `OPENAI_API_KEY`，而非网关自己的变量名。
+网关分组(openrouter / fireworks / siliconflow / qwen-token-plan / qwen-pay-as-you-go)经 AgentHub 的 OpenAI 客户端请求，因此凭证留空时读取的是 `OPENAI_API_KEY`，而非网关自己的变量名。
 
-预置目录中的部分模型：deepseek-v4-pro / deepseek-v4-flash、gemini-3.1-pro-preview、claude-opus-4-8 / claude-sonnet-4-6、gpt-5.5、glm-5.2、kimi-k2.6 等(非完整清单)。
+预置目录中的部分模型：deepseek-v4-pro / deepseek-v4-flash、gemini-3.1-pro-preview、claude-opus-4-8 / claude-sonnet-4-6、gpt-5.5、glm-5.2、kimi-k2.6、qwen3.8-max-preview 等(非完整清单)。
 
 ## 思考等级