chore: update skills_ref for safe OfficeCLI writes

[parkjs101]

What changed

Advances the skills_ref submodule from 2b14081c to merged commit 8f8e393c (cli-jaw-skills PR #1).

The merged skills change:

• routes Windows DataFrame bulk writes through explicit-cell officecli batch --input
• preserves CJK, embedded newlines, and numeric types
• requires officecli close plus exact persisted-cell read-back
• keeps officecli import only as a verified non-Windows legacy path

This closes the cli-jaw-owned routing gap reported in #279 and #295.

Root cause

On Windows, released OfficeCLI builds can report a successful CSV import and pass validate while persisting empty cells. The skill previously recommended that silent-loss path as its default.

Verification

• rebased on current origin/dev (c6b3e0a5)
• OFFICECLI_BIN=C:\Users\user\AppData\Local\OfficeCli\officecli.exe uv run --no-project --with pytest pytest skills_ref/tests/test_officecli_data_pipeline.py -q → 7 passed
• real OfficeCLI 1.0.45 round-trip verifies Korean text, an embedded newline, and numeric data after close
• git diff --check origin/dev...HEAD passed

Closes #279
Closes #295