fix(render): per-level heading numbering via numbly; config-driven, offline (WU-C)

Fixes the numbering bug (single pattern "一、" reused across levels → level-2
rendered "二、一、…"). display now takes a `config` dict; heading numbering uses
numbly per level — framework default ("{1:一}、","{1:1}.{2:1}","{1:1}.{2:1}.{3:1}")
→ 一、 / 1.1 / 1.1.1 — overridable via config.numbering.heading from the
engineering file (ADR-0009's file-resident override path, the layer whose absence
caused the bug). Verified: grep "二、一" = 0 across all smoke PDFs.

Adds @preview/numbly:0.1.0 (pure typst, zero transitive deps), VENDORED in-repo
at render/vendor/typst-packages/preview/numbly/0.1.0/ for network-free CI;
resolve via --package-cache-path render/vendor/typst-packages. parts contract +
student/teacher field visibility unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

render/vendor/typst-packages/preview/numbly/0.1.0/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 梦飞翔
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

render/vendor/typst-packages/preview/numbly/0.1.0/README.md

@@ -0,0 +1,43 @@
+# numbly
+
+A package that helps you to specify different numbering formats for different levels of headings.
+
+Suppose you want to specify the following numbering format for your document:
+
+- Appendix A. Guide
+  - A.1. Installation
+    - Step 1. Download
+    - Step 2. Install
+  - A.2. Usage
+
+You might use `if` to achieve this:
+
+```typst
+#set heading(numbering: (..nums) => {
+  nums = nums.pos()
+  if nums.len() == 1 {
+    return "Appendix " + numbering("A.", ..nums)
+  } else if nums.len() == 2 {
+    return numbering("A.1.", ..nums)
+  } else {
+    return "Step " + numbering("1.", nums.last())
+  }
+})
+
+= Guide
+== Installation
+=== Download
+=== Install
+== Usage
+```
+
+But with `numbly`, you can do this more easily:
+
+```typst
+#import "@preview/numbly:0.1.0": numbly
+#set heading(numbering: numbly(
+  "Appendix {1:A}.", // use {level:format} to specify the format
+  "{1:A}.{2}.", // if format is not specified, arabic numbers will be used
+  "Step {3}.", // here, we only want the 3rd level
+))
+```

render/vendor/typst-packages/preview/numbly/0.1.0/lib.typ

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+#let numbly(..arr, default: "1.") = (..nums) => {
+  let arr = arr.pos()
+  nums = nums.pos()
+  if nums.len() > arr.len() {
+    if default == none {
+      return none
+    }
+    if type(default) == function {
+      return default(..nums)
+    }
+    return numbering(default, ..nums)
+  }
+  let format = arr.at(nums.len() - 1)
+  if format == none {
+    return none
+  }
+  if type(format) == function {
+    return format(..nums)
+  }
+  format.replace(
+    regex("\{(\d)(:(.+?))?\}"),
+    m => {
+      let (a, b, c) = m.captures
+      if b != none {
+        numbering(c, nums.at(int(a) - 1))
+      } else {
+        str(nums.at(int(a) - 1))
+      }
+    },
+  )
+}

render/vendor/typst-packages/preview/numbly/0.1.0/typst.toml

@@ -0,0 +1,10 @@
+[package]
+name = "numbly"
+version = "0.1.0"
+entrypoint = "lib.typ"
+authors = ["flaribbit <@flaribbit>"]
+license = "MIT"
+description = "A package that helps you to specify different numbering formats for different levels of headings."
+categories = ["utility"]
+keywords = ["numbering", "helper", "tool"]
+repository = "https://github.com/flaribbit/numbly"