Send the full task to the thread title service

[brsbl]

Human comments

What was wrong

Thread title generation sent the AI title service the same 80-column string bb uses as the fallback title, so the task was cut to 80 display columns before inference. This has been true since title generation moved to the templates package in March; #3887 kept the clamp when it split out invoked commands. Anything after the first ~80 characters never reached the model, so it guessed. In Cole's #bugs report, the model only got this:

For the plan graph tooling, Can we show in the background of the plan graph v...

The thread was titled "Add back-button navigation to plan graph tools", even though the request was for a burndown chart.

What changed

• apps/server/src/services/threads/title-generation.ts: the title service now receives the full cleaned task (from Cole's Fix thread title generation truncating task context #4827, which was auto-closed by the contributor allowlist). It is capped at 4000 display columns so a huge paste can't make titling slow or expensive. Fallback titles still fit 80 columns, and generated titles still fit 48.
• generate-thread-metadata.md: updated the cleanedPrompt variable description.
• Tests: added the burndown regression, a test for the 4000-column cap, wide/supplementary Unicode cases, and a long bare skill name.

How you verified

Remote CI (@bb/server title-generation suites). The new burndown and long-skill-name cases fail on main, where the task is cut at 80 columns. The cap test covers a 10,000-character paste.

Original fix by @its-rosetta in #4827.

BB-Thread-ID: thr_a4y66pq7d2

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