Add solution notes scaffold and sub-heading format

- roadmap.org: problems now have *** Python and *** C++ sub-headings,
  plus Notes: links to per-problem org files
- scaffold-notes.mjs: creates 199 note files in org/cpp/dsa/<topic>/
  with backlinks to roadmap.org
- 18 topic folders under org/cpp/dsa/ for NeetCode 150 problems
- Updated AGENTS.md with new conventions and workflow

org/cpp/dsa/math-geometry/0009-palindrome-number.org

@@ -0,0 +1,8 @@
+* TODO 0009. Palindrome Number :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0009. Palindrome Number][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0012-integer-to-roman.org

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+* TODO 0012. Integer to Roman :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0012. Integer to Roman][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0043-multiply-strings.org

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+* TODO 0043. Multiply Strings :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0043. Multiply Strings][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0048-rotate-image.org

@@ -0,0 +1,8 @@
+* TODO 0048. Rotate Image :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0048. Rotate Image][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0050-pow-x-n.org

@@ -0,0 +1,8 @@
+* TODO 0050. Pow(x, n) :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0050. Pow(x, n)][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0054-spiral-matrix.org

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+* TODO 0054. Spiral Matrix :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0054. Spiral Matrix][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0066-plus-one.org

@@ -0,0 +1,8 @@
+* TODO 0066. Plus One :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0066. Plus One][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0073-set-matrix-zeroes.org

@@ -0,0 +1,8 @@
+* TODO 0073. Set Matrix Zeroes :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0073. Set Matrix Zeroes][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0202-happy-number.org

@@ -0,0 +1,8 @@
+* TODO 0202. Happy Number :easy:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0202. Happy Number][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0296-best-meeting-point.org

@@ -0,0 +1,8 @@
+* TODO 0296. Best Meeting Point :hard:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0296. Best Meeting Point][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/0840-magic-squares-in-grid.org

@@ -0,0 +1,8 @@
+* TODO 0840. Magic Squares In Grid :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*0840. Magic Squares In Grid][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/1780-check-if-number-is-a-sum-of-powers-of-three.org

@@ -0,0 +1,8 @@
+* TODO 1780. Check if Number is a Sum of Powers of Three :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*1780. Check if Number is a Sum of Powers of Three][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/2013-detect-squares.org

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+* TODO 2013. Detect Squares :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*2013. Detect Squares][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/2326-spiral-matrix-iv.org

@@ -0,0 +1,8 @@
+* TODO 2326. Spiral Matrix IV :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*2326. Spiral Matrix IV][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src

org/cpp/dsa/math-geometry/2698-find-the-punishment-number-of-an-integer.org

@@ -0,0 +1,8 @@
+* TODO 2698. Find the Punishment Number of an Integer :medium:
+:PROPERTIES:
+:NEETCODE: [[../../../../leetcode/out/roadmap.org::*2698. Find the Punishment Number of an Integer][Roadmap]]
+:END:
+
+#+begin_src cpp
+
+#+end_src