feat(tui): support multiline status commands

[ousamabenyounes]

Related Issue

Resolve #2448

Problem

status_line.command discarded everything after the first stdout line, preventing custom HUD-style footers from presenting multiple pieces of status information without crowding a single row.

What changed

• Preserve byte-capped command stdout instead of stopping at the first newline.
• Render up to five custom status lines, followed by the existing context readout.
• Keep single-line commands and failure fallback behavior unchanged.
• Document the behavior in the generated configuration guide and the English and Chinese configuration reference.
• Add a patch changeset for the Kimi Code package.

Test verification (RED → GREEN)

RED on origin/main with the regression tests only:

FAIL footer-status-line.test.ts
expected 'first\nsecond', received 'first'
expected ['model', 'branch', 'quota', context], received ['model', context]

GREEN with this patch:

Test Files  2 passed (2)
Tests       34 passed (34)

Full local suite: passed.

Test Files  1034 passed | 12 skipped (1046)
Tests       16862 passed | 3 expected fail | 83 skipped | 2 todo (16950)
Build       Kimi Code package passed

An additional full-suite run encountered one unrelated Vitest worker-exit error in packages/kap-server/test/prompts.test.ts; rerunning that file passed 27/27.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: c5c3bb9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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