docs+skills: preserve speaker's voice (语气), not just tone

Reviewer feedback: translations must carry Master Jiqun's 语气, not only
register. Add a 'Speaker's Voice (语气)' section to mpi-translation and
expand check D3 in mpi-translation-review. Also note the idea of distilling
his way of talk into a dedicated skill (docs/idea-jiqun-voice-skill.md).

docs/idea-jiqun-voice-skill.md

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+# Idea: distill Master Jiqun's way of talk (语气) into a skill
+
+Date: 2026-07-20
+Status: idea / not scheduled
+
+## Background
+
+Reviewer feedback on a translated article: translations must preserve Master
+Jiqun's 语气 — the speaker's voice and manner — not just the tone (register,
+formality). A translation can have the right register and still flatten the
+teacher's voice.
+
+As a first step, a "Speaker's Voice (语气)" section was added to
+`skills/mpi-translation/SKILL.md`, and check D3 in
+`skills/mpi-translation-review/SKILL.md` was expanded to verify 语气 markers.
+That covers the immediate need, but the knowledge is currently a short bullet
+list inside a general skill.
+
+## Idea
+
+Distill Master Jiqun's way of talk into a dedicated skill (or a reference doc
+under `skills/mpi-translation/references/`), built from evidence across many
+of his talks:
+
+- Collect characteristic passages (source + approved translations) from the
+  terms DB (`loc` fields) and finished articles in `translate-files/`.
+- Catalog his recurring devices: rhetorical question chains, first-person
+  asides (我经常说 / 我曾在讲座中 / 由此我想到), reasoning connectives
+  (可见 / 所以说 / 事实上), homely analogies (rotting apple, leaking boat,
+  teacup, face mask), gentle admonition with humor, measured unhurried
+  authority, inclusive we/you address.
+- For each device, give approved English renderings and common failure modes
+  (e.g. question → declaration, "我经常说" → "it is said").
+- Possibly also cover delivery/register differences between his oral talks,
+  essays, and micro-blog posts.
+
+## Open questions
+
+- Standalone skill vs. reference doc under `mpi-translation`? A reference doc
+  is probably enough; a full skill may be overkill.
+- Who approves the example translations used as evidence?
+- Should it also cover other MPI teachers, or stay Jiqun-specific?