feat(skill): scaffold skill package with /understand-chat command

Add the @understand-anything/skill package with context-builder (search +
1-hop expansion + layer resolution), chat prompt builder, skill definition
for Claude Code, and 14 passing tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -89,6 +89,22 @@ importers:
         specifier: ^6.0.0
         version: 6.4.1(@types/node@25.5.0)(jiti@2.6.1)(lightningcss@1.31.1)
 
+  packages/skill:
+    dependencies:
+      '@understand-anything/core':
+        specifier: workspace:*
+        version: link:../core
+    devDependencies:
+      '@types/node':
+        specifier: ^22.0.0
+        version: 22.19.15
+      typescript:
+        specifier: ^5.7.0
+        version: 5.9.3
+      vitest:
+        specifier: ^3.1.0
+        version: 3.2.4(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1)
+
 packages:
 
   '@babel/code-frame@7.29.0':
@@ -775,6 +791,9 @@ packages:
   '@types/estree@1.0.8':
     resolution: {integrity: sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==}
 
+  '@types/node@22.19.15':
+    resolution: {integrity: sha512-F0R/h2+dsy5wJAUe3tAU6oqa2qbWY5TpNfL/RGmo1y38hiyO1w3x2jPtt76wmuaJI4DQnOBu21cNXQ2STIUUWg==}
+
   '@types/node@25.5.0':
     resolution: {integrity: sha512-jp2P3tQMSxWugkCUKLRPVUpGaL5MVFwF8RDuSRztfwgN1wmqJeMSbKlnEtQqU8UrhTmzEmZdu2I6v2dpp7XIxw==}
 
@@ -1231,6 +1250,9 @@ packages:
     engines: {node: '>=14.17'}
     hasBin: true
 
+  undici-types@6.21.0:
+    resolution: {integrity: sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==}
+
   undici-types@7.18.2:
     resolution: {integrity: sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==}
 
@@ -1907,6 +1929,10 @@ snapshots:
 
   '@types/estree@1.0.8': {}
 
+  '@types/node@22.19.15':
+    dependencies:
+      undici-types: 6.21.0
+
   '@types/node@25.5.0':
     dependencies:
       undici-types: 7.18.2
@@ -1942,6 +1968,14 @@ snapshots:
       chai: 5.3.3
       tinyrainbow: 2.0.0
 
+  '@vitest/mocker@3.2.4(vite@7.3.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1))':
+    dependencies:
+      '@vitest/spy': 3.2.4
+      estree-walker: 3.0.3
+      magic-string: 0.30.21
+    optionalDependencies:
+      vite: 7.3.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1)
+
   '@vitest/mocker@3.2.4(vite@7.3.1(@types/node@25.5.0)(jiti@2.6.1)(lightningcss@1.31.1))':
     dependencies:
       '@vitest/spy': 3.2.4
@@ -2362,6 +2396,8 @@ snapshots:
 
   typescript@5.9.3: {}
 
+  undici-types@6.21.0: {}
+
   undici-types@7.18.2: {}
 
   update-browserslist-db@1.2.3(browserslist@4.28.1):
@@ -2374,6 +2410,27 @@ snapshots:
     dependencies:
       react: 19.2.4
 
+  vite-node@3.2.4(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1):
+    dependencies:
+      cac: 6.7.14
+      debug: 4.4.3
+      es-module-lexer: 1.7.0
+      pathe: 2.0.3
+      vite: 6.4.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1)
+    transitivePeerDependencies:
+      - '@types/node'
+      - jiti
+      - less
+      - lightningcss
+      - sass
+      - sass-embedded
+      - stylus
+      - sugarss
+      - supports-color
+      - terser
+      - tsx
+      - yaml
+
   vite-node@3.2.4(@types/node@25.5.0)(jiti@2.6.1)(lightningcss@1.31.1):
     dependencies:
       cac: 6.7.14
@@ -2395,6 +2452,20 @@ snapshots:
       - tsx
       - yaml
 
+  vite@6.4.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1):
+    dependencies:
+      esbuild: 0.25.12
+      fdir: 6.5.0(picomatch@4.0.3)
+      picomatch: 4.0.3
+      postcss: 8.5.8
+      rollup: 4.59.0
+      tinyglobby: 0.2.15
+    optionalDependencies:
+      '@types/node': 22.19.15
+      fsevents: 2.3.3
+      jiti: 2.6.1
+      lightningcss: 1.31.1
+
   vite@6.4.1(@types/node@25.5.0)(jiti@2.6.1)(lightningcss@1.31.1):
     dependencies:
       esbuild: 0.25.12
@@ -2409,6 +2480,20 @@ snapshots:
       jiti: 2.6.1
       lightningcss: 1.31.1
 
+  vite@7.3.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1):
+    dependencies:
+      esbuild: 0.27.4
+      fdir: 6.5.0(picomatch@4.0.3)
+      picomatch: 4.0.3
+      postcss: 8.5.8
+      rollup: 4.59.0
+      tinyglobby: 0.2.15
+    optionalDependencies:
+      '@types/node': 22.19.15
+      fsevents: 2.3.3
+      jiti: 2.6.1
+      lightningcss: 1.31.1
+
   vite@7.3.1(@types/node@25.5.0)(jiti@2.6.1)(lightningcss@1.31.1):
     dependencies:
       esbuild: 0.27.4
@@ -2423,6 +2508,47 @@ snapshots:
       jiti: 2.6.1
       lightningcss: 1.31.1
 
+  vitest@3.2.4(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1):
+    dependencies:
+      '@types/chai': 5.2.3
+      '@vitest/expect': 3.2.4
+      '@vitest/mocker': 3.2.4(vite@7.3.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1))
+      '@vitest/pretty-format': 3.2.4
+      '@vitest/runner': 3.2.4
+      '@vitest/snapshot': 3.2.4
+      '@vitest/spy': 3.2.4
+      '@vitest/utils': 3.2.4
+      chai: 5.3.3
+      debug: 4.4.3
+      expect-type: 1.3.0
+      magic-string: 0.30.21
+      pathe: 2.0.3
+      picomatch: 4.0.3
+      std-env: 3.10.0
+      tinybench: 2.9.0
+      tinyexec: 0.3.2
+      tinyglobby: 0.2.15
+      tinypool: 1.1.1
+      tinyrainbow: 2.0.0
+      vite: 7.3.1(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1)
+      vite-node: 3.2.4(@types/node@22.19.15)(jiti@2.6.1)(lightningcss@1.31.1)
+      why-is-node-running: 2.3.0
+    optionalDependencies:
+      '@types/node': 22.19.15
+    transitivePeerDependencies:
+      - jiti
+      - less
+      - lightningcss
+      - msw
+      - sass
+      - sass-embedded
+      - stylus
+      - sugarss
+      - supports-color
+      - terser
+      - tsx
+      - yaml
+
   vitest@3.2.4(@types/node@25.5.0)(jiti@2.6.1)(lightningcss@1.31.1):
     dependencies:
       '@types/chai': 5.2.3