feat(cph): implement nested outline manifest and batch/combined export

ADR-0029 — nested outline manifest, supersedes ADR-0008's flat [[parts]]:
- cph-model: recursive loader over manifest.toml containers / element.toml
  leaves; Lesson.parts (pure elements, DFS order) + Lesson.outline (elements
  interleaved with section headings at their DFS-open position); rejects
  ambiguous/incomplete folders and root-vs-container table misplacement
- cph-diag: new DiagCode::ManifestMalformed for carrier-document structure
  errors (discharges an existing TODO)
- cph-typst: augmented manifest now serializes the outline (element/section
  entries) instead of a flat parts array
- render/lib.typ: render-lesson renders section headings at their depth
- examples/TH-141 migrated to 5 nested section containers + 3 root segments,
  byte-identical element order; smoke-verified via cph check/build + pdftotext

ADR-0030 — batch & combined export, extends ADR-0009/0011:
- cph build with no --target batches every declared target (repeatable
  --target for an explicit subset); any target failure => non-zero exit,
  per-target ledger, independent per-target execution
- cph-model: bundle.toml loader (directory + [info]/[targets.*]/ordered
  lessons with per-lesson target overrides)
- cph-typst: augmented bundle manifest (path-prefixed member outlines),
  Engine::{compile_check_bundle,build_bundle_pdf}
- render/lib.typ: render-bundle assembles member lessons under per-lesson
  headings, depth-shifts their own section headings, resets example/lemma
  counters at each lesson boundary by default
- cph-cli: `cph bundle <path> --target <name>` subcommand, same batching
  contract as `cph build`
- new bundle fixtures/tests (cph-model unit + cph-typst through-template PDF
  compile), smoke-verified via a real 2-lesson merged PDF

Verification: cargo fmt/clippy/test clean across the workspace (68 tests);
real cph check/build/bundle runs against TH-141 and a bundle fixture, PDF
content inspected via pdftotext.

render/templates/README.md

@@ -1,4 +1,4 @@
-# Default export templates (ADR-0011)
+# Default export templates (ADR-0011, outline shape ADR-0029)
 
 `student.typ` / `teacher.typ` are the **framework default templates**. In a real
 engineering file they live at `exports/student.typ` / `exports/teacher.typ`; the
@@ -9,11 +9,16 @@ offline smoke test below.
 Each template:
 
 1. reads the injected manifest: `toml(sys.inputs.manifest)`;
-2. loops `manifest.parts`, `include`-ing each content field via a computed
-   **root-relative absolute** path `/<part.path>/<field>.typ`, and reading scalar
-   fields (example `source`) from `/<part.path>/element.toml`;
-3. assembles a `parts` array and calls `cph-render`'s `render-lesson(...)`,
-   passing the per-level heading numbering (presentation lives in the template).
+2. loops `manifest.outline` (ADR-0029's depth-first rendering order — elements
+   interleaved with section headings at their DFS-open position). For an
+   `type = "element"` entry: `include`-ing each content field via a computed
+   **root-relative absolute** path `/<part.path>/<field>.typ`, and reading
+   scalar fields (example `source`) from `/<part.path>/element.toml`. For a
+   `type = "section"` entry: passing its `title`/`depth` straight through — no
+   content to load, it is a heading;
+3. assembles an `outline` array of entry dicts and calls `cph-render`'s
+   `render-lesson(...)`, passing the per-level heading numbering (presentation
+   lives in the template).
 
 ## Why the include loop is in the template, not in cph-render
 
@@ -23,7 +28,7 @@ root**. A dynamic `include` written inside the package resolves against the
 *package* dir — even an absolute `/segments/x.typ` — never the engineering
 `--root`. Verified empirically. The template lives under `--root`, so its
 `/<part.path>/<field>.typ` resolves against `--root`. Hence the template loads
-content and hands `render-lesson` an already-assembled `parts` array;
+content and hands `render-lesson` an already-assembled `outline` array;
 `render-lesson` never includes anything.
 
 ## Key path facts for the engine
@@ -36,9 +41,13 @@ content and hands `render-lesson` an already-assembled `parts` array;
   relative to the *template's* location (`exports/`), so a bare
   `manifest=manifest.toml` would look in `exports/`. Pass the leading `/`.
 - **Optional content presence** (lemma `proof`): typst has no file-exists
-  primitive, so the template cannot probe disk. It reads a per-part `fields`
-  array from the manifest listing the content fields present on disk. *(OPEN: the
-  exact manifest shape for this is for the Rust/manifest contract to pin.)*
+  primitive, so the template cannot probe disk. It reads a per-element
+  `fields` array from the manifest listing the content fields present on
+  disk. *(OPEN: the exact manifest shape for this is for the Rust/manifest
+  contract to pin.)*
+- **Sections carry no content fields.** A `type = "section"` outline entry
+  (ADR-0029) has only `kind`/`title`/`depth`/`path`; the template passes it
+  through untouched — no `include`, no `element.toml` read.
 
 ## Offline smoke test
 
@@ -60,4 +69,7 @@ typst compile --root examples/smoke-eng \
 ```
 
 (`examples/smoke-eng/exports/{student,teacher}.typ` are copies of the defaults
-here, mirroring how a real engineering file carries its own templates.)
+here, mirroring how a real engineering file carries its own templates. The
+`examples/smoke-eng/manifest.toml` is hand-authored directly in the augmented
+`[[outline]]` shape that `cph_typst::build_augmented_manifest` would otherwise
+produce, since this smoke test bypasses the Rust engine entirely.)

render/templates/merged.typ

@@ -0,0 +1,76 @@
+// DEFAULT BUNDLE TEMPLATE (ADR-0030, outline shape ADR-0029).
+//
+// Lives in a bundle at `<bundle-root>/exports/<target>.typ`, e.g.
+// `exports/merged.typ`. Compiled AS MAIN with the augmented BUNDLE manifest
+// injected:
+//   typst compile --root <bundle-root> --input manifest=<path-rel-to-root> exports/merged.typ <out>
+//
+// Structurally identical to the single-lesson `student.typ`/`teacher.typ`
+// templates (see their notes on why the include loop lives in the template,
+// not in cph-render), except it reads `manifest.lessons` (an ordered array of
+// per-lesson `(info, target, outline)` tables — see
+// `cph_typst::build_augmented_bundle_manifest`) instead of a single
+// `manifest.outline`, and calls `render-bundle` instead of `render-lesson`.
+//
+// Every outline entry's `path` in a bundle manifest is ALREADY prefixed with
+// that lesson's own bundle-root-relative directory (done by the Rust engine),
+// so the same `include "/" + path + "/" + field + ".typ"` computation used by
+// a single-lesson template resolves correctly here too — no special-casing
+// needed in this loop.
+
+#import "@local/cph-render:0.1.0": render-bundle, part-fields, default-heading-numbering
+
+#let manifest = toml(sys.inputs.manifest)
+#let info = manifest.at("info", default: (:))
+#let raw-lessons = manifest.at("lessons", default: ())
+
+// Assemble one outline entry exactly as a single-lesson template would.
+#let assemble-entry(raw) = {
+  if raw.at("type", default: "element") == "section" {
+    (
+      entry-type: "section",
+      kind: raw.at("kind", default: none),
+      title: raw.at("title", default: ""),
+      depth: raw.at("depth", default: 1),
+    )
+  } else {
+    let kind = raw.at("kind", default: none)
+    let path = raw.at("path", default: none)
+    let spec = part-fields.at(kind, default: (content: (), optional-content: (), scalars: ()))
+    let present = raw.at("fields", default: ())
+    let entry = (entry-type: "element", kind: kind)
+
+    for field in spec.content {
+      entry.insert(field, include "/" + path + "/" + field + ".typ")
+    }
+    for field in spec.optional-content {
+      if field in present {
+        entry.insert(field, include "/" + path + "/" + field + ".typ")
+      }
+    }
+    if spec.scalars.len() > 0 {
+      let element = toml("/" + path + "/element.toml")
+      for field in spec.scalars {
+        let v = element.at(field, default: none)
+        if v != none and v != "" { entry.insert(field, v) }
+      }
+    }
+    entry
+  }
+}
+
+#let lessons = raw-lessons.map(raw => (
+  info: raw.at("info", default: (:)),
+  target: raw.at("target", default: "student"),
+  outline: raw.at("outline", default: ()).map(assemble-entry),
+))
+
+// Presentation: shared per-level heading numbering across the whole bundle,
+// and the ADR-0030 recommended default of resetting auto-counters at each
+// lesson boundary (override `reset-counters: false` for continuous numbering).
+#render-bundle(
+  info: info,
+  lessons: lessons,
+  heading-numbering: default-heading-numbering,
+  reset-counters: true,
+)

render/templates/student.typ

@@ -1,4 +1,4 @@
-// DEFAULT STUDENT TEMPLATE (framework default; ADR-0011).
+// DEFAULT STUDENT TEMPLATE (framework default; ADR-0011, outline shape ADR-0029).
 //
 // This is a *real, editable* file that lives in an engineering file at
 // `exports/student.typ`. The framework compiles it AS THE MAIN FILE with the
@@ -15,15 +15,16 @@
 // its own virtual root — an include inside cph-render would resolve against the
 // PACKAGE, not the engineering root. A `/<part.path>/<field>.typ` written HERE
 // (this template lives under `--root`) resolves against `--root`. So the
-// template loads content and hands cph-render an already-assembled `parts` array.
+// template loads content and hands cph-render an already-assembled `outline`
+// array (elements interleaved with section headings, ADR-0029).
 //
 // OPEN CONTRACT POINT — optional-content presence. typst has no "does this file
 // exist" primitive (a missing `include` is a hard compile error). So the
 // template CANNOT probe disk the way the old Rust driver did for lemma `proof`.
 // It relies on the manifest declaring which optional content fields are present,
-// via a per-part `fields` array listing the content fields that exist on disk
+// via a per-element `fields` array listing the content fields that exist on disk
 // (the engine knows this — it walks the part dir). Required fields are loaded
-// unconditionally; optional fields load only if listed in `fields`. If a part
+// unconditionally; optional fields load only if listed in `fields`. If an element
 // omits `fields`, optional content is skipped (conservative). The exact shape of
 // this declaration is for the manifest/Rust contract to pin.
 
@@ -35,38 +36,51 @@
 // Read the injected manifest (a path string relative to typst --root).
 #let manifest = toml(sys.inputs.manifest)
 #let info = manifest.at("info", default: (:))
-#let raw-parts = manifest.at("parts", default: ())
+#let raw-outline = manifest.at("outline", default: ())
 
-// Assemble each part: include its content fields (computed absolute paths,
-// resolved against --root) and read scalar fields from <path>/element.toml.
-// `part-fields` (from cph-render) is the single source of truth for kind->fields.
-#let parts = raw-parts.map(raw => {
-  let kind = raw.at("kind", default: none)
-  let path = raw.at("path", default: none)
-  let spec = part-fields.at(kind, default: (content: (), optional-content: (), scalars: ()))
-  // Which optional content fields are present on disk (manifest-declared).
-  let present = raw.at("fields", default: ())
-  let part = (kind: kind)
+// Assemble each outline entry:
+// - an "element" entry: include its content fields (computed absolute paths,
+//   resolved against --root) and read scalar fields from <path>/element.toml.
+//   `part-fields` (from cph-render) is the single source of truth for
+//   kind->fields.
+// - a "section" entry (ADR-0029): pass its title/depth straight through — no
+//   content to load, it is a heading.
+#let outline = raw-outline.map(raw => {
+  if raw.at("type", default: "element") == "section" {
+    (
+      entry-type: "section",
+      kind: raw.at("kind", default: none),
+      title: raw.at("title", default: ""),
+      depth: raw.at("depth", default: 1),
+    )
+  } else {
+    let kind = raw.at("kind", default: none)
+    let path = raw.at("path", default: none)
+    let spec = part-fields.at(kind, default: (content: (), optional-content: (), scalars: ()))
+    // Which optional content fields are present on disk (manifest-declared).
+    let present = raw.at("fields", default: ())
+    let entry = (entry-type: "element", kind: kind)
 
-  // Required content fields: <path>/<field>.typ (absolute, root-relative).
-  for field in spec.content {
-    part.insert(field, include "/" + path + "/" + field + ".typ")
-  }
-  // Optional content fields: only when the manifest says the file exists.
-  for field in spec.optional-content {
-    if field in present {
-      part.insert(field, include "/" + path + "/" + field + ".typ")
+    // Required content fields: <path>/<field>.typ (absolute, root-relative).
+    for field in spec.content {
+      entry.insert(field, include "/" + path + "/" + field + ".typ")
     }
-  }
-  // Scalar fields come from <path>/element.toml.
-  if spec.scalars.len() > 0 {
-    let element = toml("/" + path + "/element.toml")
-    for field in spec.scalars {
-      let v = element.at(field, default: none)
-      if v != none and v != "" { part.insert(field, v) }
+    // Optional content fields: only when the manifest says the file exists.
+    for field in spec.optional-content {
+      if field in present {
+        entry.insert(field, include "/" + path + "/" + field + ".typ")
+      }
     }
+    // Scalar fields come from <path>/element.toml.
+    if spec.scalars.len() > 0 {
+      let element = toml("/" + path + "/element.toml")
+      for field in spec.scalars {
+        let v = element.at(field, default: none)
+        if v != none and v != "" { entry.insert(field, v) }
+      }
+    }
+    entry
   }
-  part
 })
 
 // Presentation: per-level heading numbering. Default (一、 / 1.1 / 1.1.1) comes
@@ -74,6 +88,6 @@
 #render-lesson(
   info: info,
   target: target,
-  parts: parts,
+  outline: outline,
   heading-numbering: default-heading-numbering,
 )

render/templates/teacher.typ

@@ -1,4 +1,4 @@
-// DEFAULT TEACHER TEMPLATE (framework default; ADR-0011).
+// DEFAULT TEACHER TEMPLATE (framework default; ADR-0011, outline shape ADR-0029).
 //
 // Lives in an engineering file at `exports/teacher.typ`. Compiled AS MAIN with
 // the manifest injected:
@@ -18,38 +18,47 @@
 // Read the injected manifest (a path string relative to typst --root).
 #let manifest = toml(sys.inputs.manifest)
 #let info = manifest.at("info", default: (:))
-#let raw-parts = manifest.at("parts", default: ())
+#let raw-outline = manifest.at("outline", default: ())
 
-// Assemble each part: include its content fields (computed absolute paths,
-// resolved against --root) and read scalar fields from <path>/element.toml.
-// `part-fields` (from cph-render) is the single source of truth for kind->fields.
-#let parts = raw-parts.map(raw => {
-  let kind = raw.at("kind", default: none)
-  let path = raw.at("path", default: none)
-  let spec = part-fields.at(kind, default: (content: (), optional-content: (), scalars: ()))
-  // Which optional content fields are present on disk (manifest-declared).
-  let present = raw.at("fields", default: ())
-  let part = (kind: kind)
+// Assemble each outline entry: an "element" entry includes its content fields
+// and reads scalars from element.toml; a "section" entry (ADR-0029) passes
+// title/depth straight through as a heading, no content to load.
+#let outline = raw-outline.map(raw => {
+  if raw.at("type", default: "element") == "section" {
+    (
+      entry-type: "section",
+      kind: raw.at("kind", default: none),
+      title: raw.at("title", default: ""),
+      depth: raw.at("depth", default: 1),
+    )
+  } else {
+    let kind = raw.at("kind", default: none)
+    let path = raw.at("path", default: none)
+    let spec = part-fields.at(kind, default: (content: (), optional-content: (), scalars: ()))
+    // Which optional content fields are present on disk (manifest-declared).
+    let present = raw.at("fields", default: ())
+    let entry = (entry-type: "element", kind: kind)
 
-  // Required content fields: <path>/<field>.typ (absolute, root-relative).
-  for field in spec.content {
-    part.insert(field, include "/" + path + "/" + field + ".typ")
-  }
-  // Optional content fields: only when the manifest says the file exists.
-  for field in spec.optional-content {
-    if field in present {
-      part.insert(field, include "/" + path + "/" + field + ".typ")
+    // Required content fields: <path>/<field>.typ (absolute, root-relative).
+    for field in spec.content {
+      entry.insert(field, include "/" + path + "/" + field + ".typ")
     }
-  }
-  // Scalar fields come from <path>/element.toml.
-  if spec.scalars.len() > 0 {
-    let element = toml("/" + path + "/element.toml")
-    for field in spec.scalars {
-      let v = element.at(field, default: none)
-      if v != none and v != "" { part.insert(field, v) }
+    // Optional content fields: only when the manifest says the file exists.
+    for field in spec.optional-content {
+      if field in present {
+        entry.insert(field, include "/" + path + "/" + field + ".typ")
+      }
     }
+    // Scalar fields come from <path>/element.toml.
+    if spec.scalars.len() > 0 {
+      let element = toml("/" + path + "/element.toml")
+      for field in spec.scalars {
+        let v = element.at(field, default: none)
+        if v != none and v != "" { entry.insert(field, v) }
+      }
+    }
+    entry
   }
-  part
 })
 
 // Presentation: per-level heading numbering. Default (一、 / 1.1 / 1.1.1) comes
@@ -57,6 +66,6 @@
 #render-lesson(
   info: info,
   target: target,
-  parts: parts,
+  outline: outline,
   heading-numbering: default-heading-numbering,
 )