[Shellghostt]

Closes #341

Summary

Adds direct unit tests for extractUserMessageText in packages/coding-agent/src/core/session-message-text.ts, which previously had no dedicated test file. Tests only; no source changes.

Coverage

• A string is returned unchanged (including the empty string).
• Text parts are joined with no separator.
• Non-text parts (e.g. { type: "image" }) are skipped.
• Text parts with no text field are skipped.
• An empty array returns "".

Tests

• node ../../node_modules/vitest/dist/cli.js --run test/session-message-text.test.ts (from packages/coding-agent) — 5 passed.
• biome check test/session-message-text.test.ts — clean after formatting.

[dmae97]

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