skills: rename dharma-translation→translation, delete mpi-project-conventions, move references

- dharma-translation → translation: stripped conventions, kept only technique
- Deleted mpi-project-conventions: all content now in AGENTS.md
- References moved: meditation-translation, markdown-to-djot → translation/
  translation-pitfalls, proofreading-patterns → translation-review/
- Updated AGENTS.md, readme.dj, memory, pdf skill cross-reference
- 7 skills → 6 skills

skills/translation/references/meditation-translation.md

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+# Meditation / Mindfulness Content Translation
+
+When the source is a guided meditation script, exercise guide, posture instruction,
+or breathing practice (rather than a Dharma talk, sutra commentary, or teaching text),
+use a lighter workflow than the full dharma-translation pipeline.
+
+## Register
+
+Default to warm, direct instructional voice (Thầy-adjacent):
+- Second-person address ("you")
+- Concrete images, sensory details
+- Oral rhythm, short sentences
+- Present tense, imperative mood
+
+MB corpus consultation is NOT needed for register — this content type has its own
+well-established English conventions (yoga/meditation instructional voice).
+
+## Terms
+
+Terms DB lookup for Buddhist-mindfulness vocabulary is useful but limited to key terms:
+- 正念 → mindfulness
+- 觉知 → awareness
+- 无我 → depends on context: "non-self" for philosophical/Dharma content; "selflessly" for embodied/movement instruction where the sense is no separate controller imposing on the action
+- 中道 → Middle Way
+- 丹田 → dantian (keep as-is; well-known in meditation/qigong)
+
+Context-sensitive terms:
+- 心 (xīn): in meditation/movement contexts it often means "mind/attention" not emotional "heart." 持心 means holding the mind with focused attention, not holding with emotion.
+- 念 (niàn): mindfulness/attention/recollection — context between these.
+- Buddhist philosophical terms (无我, 空, 缘起) in non-philosophical contexts (movement instruction, body scans) may need practical/concrete translations rather than doctrinal ones.
+
+Skip deep terms alignment unless dense Dharma vocabulary (emptiness, dependent origination,
+Buddha-nature, etc.) appears in the text.
+
+## Comparison files
+
+Still create 对照.dj as usual. See comparison file format in this skill.
+
+## Pitfalls
+
+- **Don't add formatting the source doesn't have**: sub-section labels using `【】` in Chinese should become plain `[label]` in English, not `*[label]*` or `**[label]**`. Match the source's formatting level exactly.
+- **`**text**` is Markdown, not Djot**: Djot emphasis uses single asterisks (`*text*`). Never use double asterisks in `.dj` files.
+- **心 ≠ heart by default**: in meditation/movement contexts, 持心 = holding the mind with attention, not holding with emotion. Translate based on context, not dictionary defaults.