[ump45nose]

External MCP clients can read a task's text but cannot retrieve the files linked in its final report. Add thread_file_read so clients can download those files through the authenticated connection and deliver them with their own attachment tools.

Files must be explicitly linked in the latest final report and resolve to regular files inside the Thread's execution workspace. The snapshot exposes cwd when known. Reads are bounded to 1 MiB per chunk (256 KiB by default), and continuation checks a file revision to avoid combining different versions. No public download URL or directory browsing is added.

Validation:

• Host Runtime and its local dependencies typechecked; 18 focused result-file, official MCP SDK, and Thread snapshot tests passed; affected-file ESLint and formatting passed.
• CI passed Linux x64, Linux ARM64, and Windows. The macOS lane failed waiting for relay capacity/reconnection in packages/web-server/test/relay-client.test.ts:96 (65-second timeout); this PR does not modify that code: https://github.com/BytePioneer-AI/codex-host/actions/runs/42812630647/job/129817638097.

Linux headless external-client availability is tracked separately in #788.

[coderabbitai]

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