Co-locate AL samples next to their knowledge articles

The /samples/ top-level tree is replaced with sibling files in each
knowledge-layer folder. An article and its demonstrations now live
side-by-side:

  microsoft/knowledge/<domain>/<slug>.md
  microsoft/knowledge/<domain>/<slug>.good.al
  microsoft/knowledge/<domain>/<slug>.bad.al

Rationale:
- Proximity. An article and its paired samples are one unit; the
  filesystem now reflects that.
- Layer ownership. Samples inherit layer precedence for free -- a
  /custom/ fork can override an article and its samples atomically,
  which the shared /samples/ tree previously made awkward.
- Trivial migration path. Action-skill source globs
  (*/knowledge/<domain>/**/*.md) are unchanged; sample discovery is a
  sibling-filename lookup.

Changes:
- git mv of all 65 sample files from samples/<domain>/<slug>/{bad,good}.al
  to microsoft/knowledge/<domain>/<slug>.{bad,good}.al (history preserved).
- Update See-sample references in all 37 articles that ship samples.
- skills/read.md: replace the no-code-blocks bullet with a pointer to a
  new Sample files section that fully specifies the sibling convention,
  the kinds (good/bad + forward-compatible), multi-technology rules,
  demonstration-only status, and layer-precedence behaviour.
- skills/write.md: update the samples pointer to match.
- README.md: annotate the knowledge tree with the sample sibling shape.
- samples/README.md deleted; content lifted into skills/read.md.
- Both generators (C:\temp\gen_performance_knowledge.py,
  C:\temp\gen_security_knowledge.py) updated to emit at the new paths
  and to stop writing samples/README.md. Re-running them is idempotent
  against the committed layout.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

skills/read.md

@@ -18,7 +18,7 @@ A knowledge file is a single markdown file that covers **one concern** in Busine
 - A YAML frontmatter block with the fields below. All fields are required.
 - A `## Description` section. Required.
 - Optional sections — typically `## Best Practice` and `## Anti Pattern`, but any `##` section is permitted.
-- No fenced code blocks. Sample code lives in separate sample files referenced by path.
+- No fenced code blocks. Sample code lives in **sibling files** next to the article (see [Sample files](#sample-files) below).
 
 A file that violates any of these rules is invalid and MUST be skipped by consumers. Do not attempt to partially parse invalid files.
 
@@ -115,6 +115,26 @@ Consumers MUST NOT silently treat missing context as a match.
 
 A consumer that produces output referencing a knowledge file MUST cite it by its repo-relative path (for example, `microsoft/knowledge/performance/filter-before-find.md`). Line numbers are not stable references; use the file path only. If a commit SHA is available to the consumer, it SHOULD be included alongside the path.
 
+## Sample files
+
+Knowledge files MUST NOT contain fenced code blocks. When an article needs to show code, it ships the code as one or more **sibling files** next to the article, using this naming convention:
+
+```
+<layer>/knowledge/<domain>/<slug>.md         # the article
+<layer>/knowledge/<domain>/<slug>.good.al    # best-practice demonstration
+<layer>/knowledge/<domain>/<slug>.bad.al     # anti-pattern demonstration
+```
+
+Rules:
+
+- A sample file is identified by the article's slug followed by a `.<kind>.<ext>` suffix. The supported kinds are `good` and `bad`. Additional kinds MAY be introduced by a layer; consumers MUST ignore unknown kinds without failing.
+- The extension matches the technology (`al`, `ps1`, `js`, `kql`, …). A single article MAY carry samples in multiple technologies if the article's frontmatter `technologies` lists them.
+- Articles MAY have a `good` sample only, a `bad` sample only, both, or neither. The article text SHOULD reference each sample it ships, using a relative path like `` `<slug>.good.al` ``.
+- Samples are **demonstration-only**. They are not deployed, and they are not derived from the Business Central base application source. Authors use object IDs they own (e.g., 50100–50999 in Microsoft-authored samples) and keep each sample self-contained.
+- Layer precedence applies to sample files the same way it applies to articles: a `/custom/knowledge/<domain>/<slug>.good.al` overrides a `/microsoft/knowledge/<domain>/<slug>.good.al` for the same article in the same layer hierarchy.
+
+Consumers that surface sample code to an end user or agent SHOULD cite the sample file by its repo-relative path, in the same format as article citations.
+
 ## Retrieval workflow
 
 The standard workflow for finding applicable files: