feat(sdk/daemon-ui): render contract — markdown / HTML / plain text helpers (PR-D)

Closes the "render 契约只覆盖 terminal" gap surfaced in the PR QwenLM#4328 review:

> PR ships `daemonUiEventToTerminalText` for terminal. Web/IDE/channel
> adapters each roll their own projection. No shared contract → adapter
> divergence is inevitable.

## New helpers

```ts
daemonBlockToMarkdown(block, opts?): string  // GFM-compatible
daemonBlockToHtml(block, opts?): string      // conservatively escaped HTML
daemonBlockToPlainText(block, opts?): string // for copy-paste / logs
daemonToolPreviewToMarkdown(preview, opts?): string
```

All three respect the same `kind` discrimination so adapters can switch
between them without touching call sites.

## Per-kind projection

For each `DaemonTranscriptBlock['kind']`:

- `user` / `assistant` / `thought` — plain text with role labels
- `tool` — header with toolName + structured preview + status badge
- `shell` — fenced code block, stream-discriminated (stdout vs stderr)
- `permission` — title + options list + resolved/pending indicator
- `status` / `debug` / `error` — semantic class / role (error → role=alert)

For each `DaemonToolPreview['kind']`:

- `ask_user_question` — question + options as bullet list
- `command` — fenced bash with optional cwd comment
- `file_diff` — unified diff in fenced code block (oldText/newText OR patch)
- `file_read` — `path (lines N-M)` line
- `web_fetch` — `METHOD url` line
- `mcp_invocation` — `serverId::toolName` with args summary
- `key_value` — bullet list
- `generic` — emphasized summary

## Security

- Default HTML sanitizer escapes `<`, `>`, `&`, `"`, `'` and FIRST strips
  ANSI/control sequences via `sanitizeTerminalText` (defense against
  agent-emitted escape codes in HTML output).
- Custom sanitizer hook for consumers wanting markdown→HTML pipelines
  (markdown-it + DOMPurify, etc.).
- `sanitizeUrls` option strips token-like query params (`token=`, `key=`,
  `x-amz-`, etc.) from URLs in `web_fetch` previews.
- `maxFieldLength` truncation defaults 8192, prevents pathological
  rendering on huge content.

## Adapter conformance (out of scope for this commit)

The conformance test framework (fixture corpus + `runAdapterConformanceSuite`)
mentioned in PR-D scope is deferred to a follow-up. The render helpers
here are the precondition — once stable, the conformance framework can
use them as the reference projection.

## Test coverage (77/77 pass)

- All 9 block kinds render in markdown (verified for user/assistant/tool/
  shell/permission/error specifically)
- file_diff renders as unified diff with old/new lines
- mcp_invocation renders as `server::tool` format
- HTML escapes XSS (`<script>` → `&lt;script&gt;`)
- HTML strips terminal escape sequences before escaping
- Error blocks emit `role="alert"` for screen readers
- plain text drops markdown delimiters
- maxFieldLength truncates with ellipsis
- sanitizeUrls strips token query params
- Custom sanitizer hook works

## Roadmap

PR-D of the unified follow-up to PR QwenLM#4328 — completes the 5-PR series
(A: event coverage, B: time schema, E: state machine, C: tool preview +
content extraction, D: render contract).

Generated with AI

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: 秦奇

packages/sdk-typescript/src/daemon/ui/index.ts

@@ -24,6 +24,16 @@ export {
   daemonUiEventToTerminalText,
   transcriptBlockToTerminalText,
 } from './terminal.js';
+export {
+  daemonBlockToHtml,
+  daemonBlockToMarkdown,
+  daemonBlockToPlainText,
+  daemonToolPreviewToMarkdown,
+} from './render.js';
+export type {
+  DaemonHtmlRenderOptions,
+  DaemonRenderOptions,
+} from './render.js';
 export {
   extractContentPart,
   getOutputText,