docs(docs): restructure documentation hierarchy and rename files

docs/content/01-coding/01-arrays-and-strings/01-overview.mdx

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+---
+title: 'Arrays and Strings'
+description: 'O(1) index access, order is information.'
+sidebar:
+  icon: play
+  label: Overview
+---
+
+:::warning[Under construction]
+This page is a scaffold. Notes, canonical problems, and template code are not written yet.
+:::
+
+## Patterns
+
+- [Two Pointers](/guides/coding/contiguous-linear/two-pointers) — Converging/parallel index walk that prunes the O(n^2) pair space using order.
+- [Sliding Window](/guides/coding/contiguous-linear/sliding-window) — Two pointers plus incremental state between them.
+- [Prefix Sum](/guides/coding/contiguous-linear/prefix-sum) — Precomputed cumulative state for O(1) range queries.
+- [Binary Search](/guides/coding/contiguous-linear/binary-search) — Halving over any monotonic predicate, not just sorted arrays.
+- [Matrices](/guides/coding/contiguous-linear/matrices) — 2D index arithmetic; often a graph in disguise.
+
+**Systems anchor:** Prefix sum is a materialized view; sliding window is stream processing with an eviction policy.

docs/content/01-coding/01-arrays-and-strings/02-two-pointers.mdx

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+---
+title: 'Two Pointers'
+description: 'Converging/parallel index walk that prunes the O(n^2) pair space using order.'
+sidebar:
+  icon: sticky-note
+---
+
+:::warning[Under construction]
+This page is a scaffold. Notes, canonical problems, and template code are not written yet.
+:::

docs/content/01-coding/01-arrays-and-strings/05-sliding-window.mdx

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+---
+title: 'Sliding Window'
+description: 'Two pointers plus incremental state between them.'
+sidebar:
+  icon: sticky-note
+---
+
+:::warning[Under construction]
+This page is a scaffold. Notes, canonical problems, and template code are not written yet.
+:::

docs/content/01-coding/01-arrays-and-strings/08-prefix-sum.mdx

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+---
+title: 'Prefix Sum'
+description: 'Precomputed cumulative state for O(1) range queries.'
+sidebar:
+  icon: sticky-note
+---
+
+:::warning[Under construction]
+This page is a scaffold. Notes, canonical problems, and template code are not written yet.
+:::

docs/content/01-coding/01-arrays-and-strings/12-common-patterns.mdx

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+---
+title: 'Common Patterns'
+description: 'Precomputed cumulative state for O(1) range queries.'
+sidebar:
+  icon: star
+---
+
+:::warning[Under construction]
+This page is a scaffold. Notes, canonical problems, and template code are not written yet.
+:::

docs/content/01-coding/01-arrays-and-strings/meta.ts

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+import { defineMeta } from "blume";
+
+export default defineMeta({
+  order: 4,
+});