feat(002): add sitemap generation feature

- Refactor kmeContentSourceAdapter.js into getValidToken(), oidcAuthFlow(),
  and sitemapFlow(); add sitemap generation using hydra:member response structure
- Add searchApiBaseUrl, tenant, proxyBaseUrl fields to kme_CSA_settings.json
  and kme_CSA_settings.json.example
- Add 17 unit tests for sitemap flow and non-sitemap routing regression
- Add 5 contract tests for sitemap endpoint (proxy-http.test.js)
- Add [Unreleased] sitemap entry to CHANGELOG.md
- Add full specs/002-sitemap-generation/ artifact directory
  (spec, plan, tasks, data-model, contracts, research, quickstart, checklist)
- Update constitution.md: add redis as permitted global, refresh
  kme_CSA_settings references
- Update copilot-instructions.md SPECKIT marker to sitemap plan

.github/agents/copilot-instructions.md

@@ -0,0 +1,7 @@
+
+## Active Technologies
+- Node.js ≥18, ESM (`"type": "module"`) + `axios` (HTTP), `redis` (token cache), `xmlbuilder2` (XML — already injected as `xmlBuilder`), `uuid`, `jsonwebtoken` — all already in `package.json` (002-sitemap-generation)
+- Redis read/write (`hGet`/`hSet`) for OIDC token cache only — no new storage (002-sitemap-generation)
+
+## Recent Changes
+- 002-sitemap-generation: Added Node.js ≥18, ESM (`"type": "module"`) + `axios` (HTTP), `redis` (token cache), `xmlbuilder2` (XML — already injected as `xmlBuilder`), `uuid`, `jsonwebtoken` — all already in `package.json`

.github/copilot-instructions.md

@@ -1,7 +1,7 @@
 <!-- SPECKIT START -->
 For additional context about technologies to be used, project structure,
 shell commands, and other important information, read the current plan at
-`specs/001-oidc-proxy-script/plan.md`
+`specs/002-sitemap-generation/plan.md`
 <!-- SPECKIT END -->
 
 ## Project Overview