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/markdown-to-djot.md

@@ -0,0 +1,48 @@
+# Markdown to Djot Conversion
+
+When source material arrives as `.docx.md` (pandoc-converted from docx), convert to `.dj` for translation workflows.
+
+## Splitting combined articles
+
+If a single markdown file contains multiple articles (common when docx has two talks in one file), split at the article boundary before converting. Use `sed` by line number:
+
+```bash
+sed -n '1,218p' combined.md > a1.md
+sed -n '220,282p' combined.md > a2.md
+```
+
+## Heading anchor cleanup
+
+Pandoc's docx→md conversion adds `{#heading-id}` anchors to every heading:
+
+```markdown
+## 1．安宁疗护 {#1．安宁疗护}
+```
+
+These must be stripped before markdown→djot conversion, otherwise pandoc's djot writer leaves stray `{#...}` lines in the output:
+
+```bash
+sed 's/ {#[^}]*}//g' input.md > clean.md
+```
+
+## Conversion command
+
+```bash
+pandoc clean.md -f markdown -t djot --wrap=none -o output.dj
+```
+
+`--wrap=none` prevents reflow of long paragraphs.
+
+## Post-conversion cleanup
+
+Pandoc may still leave stray `{#...}` lines in djot output. Remove them:
+
+```bash
+sed -i '/^{#.*}$/d' output.dj
+```
+
+## Pandoc artifacts
+
+- Unicode `——` (U+2014 × 2) → `------` in djot (two em dashes, `---` each). This is correct djot syntax.
+- Markdown hard line breaks (trailing `  `) → `\\\n` in djot. Preserves original paragraph structure.
+- Pandoc normalizes heading IDs (strips `、` and other punctuation). Ignore; the stray-line cleanup handles it.