docs(skills): update paths to docs directory in problem-approach skill

.claude/skills/problem-approach/SKILL.md

@@ -1,11 +1,11 @@
 ---
 name: problem-approach
-description: Write the `## Approach` section — a Mermaid flowchart that traces the submitted solution — for every docs solution page under apps/docs/content/ that lacks one, using the repo's exact placement and node conventions. Use when asked to add/implement/fill in missing approaches, draw the approach diagram for a problem page, or when `/problem-approach` is run.
+description: Write the `## Approach` section — a Mermaid flowchart that traces the submitted solution — for every docs solution page under docs/ that lacks one, using the repo's exact placement and node conventions. Use when asked to add/implement/fill in missing approaches, draw the approach diagram for a problem page, or when `/problem-approach` is run.
 ---
 
 # Problem approach diagrams
 
-Every solution page (`apps/docs/content/(<phase>)/<topic>/(problems)/<num>_<slug>.mdx`) has a
+Every solution page (`docs/(<phase>)/<topic>/(problems)/<num>_<slug>.mdx`) has a
 hand-owned section before the script-owned one:
 
 ```
@@ -23,7 +23,7 @@ next `work/` push.
 1. **Find the pages** (numbered pages with no `## Approach` heading):
 
    ```sh
-   grep -L '^## Approach' apps/docs/content/*/*.mdx
+   grep -rL '^## Approach' docs --include='[0-9]*_*.mdx'
    ```
 
 2. **For each page**, read `## Solution` and write the diagram from *that code* — the
@@ -47,11 +47,13 @@ next `work/` push.
    ````
 
 4. **Check** each diagram by hand against the syntax rules below (the docs build does
-   not parse Mermaid — a broken diagram fails only in the browser), then run the
+   not parse Mermaid — a broken diagram fails only in the browser). The site is built
-   docs build once at the end and review the pages in `bun run dev`:
+   from prdlk/cs, which reads `docs/` over HTTP, so preview unpushed pages there
+   against this checkout (its `README` names the local-content switch), then build
+   once at the end:
 
    ```sh
-   cd apps/docs && bunx blume build --isolated && rm -rf .blume-verify
+   cd ../cs && bunx blume build --isolated && rm -rf .blume-verify
    ```
 
 Pages with two languages (`<CodeGroup>`) get **one** diagram, traced from the
@@ -59,7 +61,7 @@ Python version. Pages with only JavaScript trace the JavaScript.
 
 ## Diagram conventions
 
-Reference page: `apps/docs/content/(array)/15-3sum.mdx`. Every existing diagram
+Reference page: `docs/(01-linear-structures)/two-pointers/(problems)/15_3sum.mdx`. Every existing diagram
 follows this shape:
 
 ```mermaid