chore: migrate heading-map → translation frontmatter (#14)

* chore: migrate heading-map → translation frontmatter format

Converted all 25 lecture files from flat heading-map: YAML to
structured translation: { title, headings } format using
action-translation v0.13.0 headingmap CLI.

Backward compatible — the sync pipeline reads both formats.

* chore: bump action-translation to v0.13.0

* fix: regenerate heading-maps with MyST role stripping (v0.13.1)

Author: mmcky

.github/workflows/review-translations.yml

@@ -15,7 +15,7 @@ jobs:
         with:
           fetch-depth: 2
 
-      - uses: QuantEcon/action-translation@v0.12.4
+      - uses: QuantEcon/action-translation@v0.13.0
         with:
           mode: review
           source-repo: QuantEcon/lecture-python-programming

.translate/state/about_py.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 3
-tool-version: 0.11.1
+tool-version: 0.13.0

.translate/state/debugging.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 4
-tool-version: 0.11.1
+tool-version: 0.13.0

.translate/state/functions.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 7
-tool-version: 0.11.1
+tool-version: 0.13.0

.translate/state/getting_started.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 7
-tool-version: 0.11.1
+tool-version: 0.13.1

.translate/state/intro.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 0
-tool-version: 0.11.1
+tool-version: 0.13.0

.translate/state/jax_intro.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 6
-tool-version: 0.11.1
+tool-version: 0.13.0

.translate/state/matplotlib.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 5
-tool-version: 0.11.1
+tool-version: 0.13.0

.translate/state/names.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 9
-tool-version: 0.11.1
+tool-version: 0.13.1

.translate/state/need_for_speed.md.yml

@@ -3,4 +3,4 @@ synced-at: "2026-03-20"
 model: claude-sonnet-4-6
 mode: NEW
 section-count: 5
-tool-version: 0.11.1
+tool-version: 0.13.1