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>

README.md

@@ -107,11 +107,11 @@ For the end-to-end flow — from orchestrator trigger through to how output reac
 ├── /.github/             # Actions and workflows
 ├── /microsoft/           # Microsoft-endorsed layer
 │   ├── /knowledge/       # Knowledge files by domain
-│   │   └── /<domain>/
+│   │   └── /<domain>/    # Each article: <slug>.md + optional <slug>.good.al / <slug>.bad.al
 │   └── /skills/          # Microsoft-endorsed action skills
 ├── /community/           # BC community layer
 │   ├── /knowledge/       # Knowledge files by domain
-│   │   └── /<domain>/
+│   │   └── /<domain>/    # Article + sibling samples, same convention
 │   └── /skills/          # Community action skills
 ├── /custom/              # Partner/customer-specific overrides (empty; populated in forks)
 │   ├── /knowledge/