feat: Support GitHub Copilot (#65)

Preparation to support GitHub Copilot via [Awesome GitHub Copilot](https://awesome-copilot.github.com/).

See:
- #38
- github/awesome-copilot#1889
- github/awesome-copilot#1890

JIRA: CPOUI5FOUNDATION-1240


* refactor: Remove duplicate plugin.json

Claude Code also supports the root `plugin.json` file.

* refactor(ui5-typescript-conversion): Move skill to sub-dir

Although this seems to have worked with Claude Code, it is generally
required to place each skill in a separate sub-directory with the same
name as the skill.

* refactor(ui5): Do not list skills individually

* ci: Verify plugin.json copies stay in sync with root

Add CI step that fails when any registered copy of plugins/<name>/plugin.json
differs from the root file. Currently checks .github/plugin/plugin.json,
required by github/awesome-copilot external-plugin smoke test.

* ci: Add plugin.json copies for awesome-copilot smoke test

Copy each plugins/<name>/plugin.json to <name>/.github/plugin/plugin.json,
required by github/awesome-copilot external-plugin install verification.
Sync with root enforced by CI step added in previous commit.

* fix(ui5): Normalize keywords to lowercase-hyphenated form

The github/awesome-copilot marketplace's external-plugin validator
rejects keywords containing spaces or uppercase characters; only
lowercase letters, digits, and hyphens are allowed (max 30 chars,
max 10 entries per plugin).

Replace 'api documentation', 'development guidelines', and
'best practices' with their hyphenated equivalents so the plugin
passes intake validation when listed in plugins/external.json.

Reference:
- awesome-copilot/eng/external-plugin-validation.mjs (regex /^[a-z0-9-]+$/)
- awesome-copilot/CONTRIBUTING.md - 'Adding External Plugins'
  ('keywords as lowercase hyphenated tags')

* fix(ui5): Wrap MCP server config in mcpServers key

Align with the plugin spec, which requires a top-level "mcpServers"
wrapper around server entries. Both Claude Code and Copilot CLI
tolerated the flat shape, but the spec-compliant form is safer for
strict validators down the line.

Author: matz3

.github/workflows/ci.yml

@@ -42,3 +42,27 @@ jobs:
 
     - name: Perform dependency check
       run: npm run knip
+
+    - name: Verify plugin.json copies are in sync
+      run: |
+        set -eu
+        COPIES=(
+          ".github/plugin/plugin.json"
+        )
+        failed=0
+        for root in plugins/*/plugin.json; do
+          dir=$(dirname "$root")
+          for rel in "${COPIES[@]}"; do
+            copy="$dir/$rel"
+            if [ ! -f "$copy" ]; then
+              echo "::error file=$copy::missing copy of $root"
+              failed=1
+              continue
+            fi
+            if ! diff -u "$root" "$copy"; then
+              echo "::error file=$copy::differs from $root"
+              failed=1
+            fi
+          done
+        done
+        exit $failed

…pt-conversion/.claude-plugin/plugin.json …pt-conversion/.github/plugin/plugin.jsonplugins/ui5-typescript-conversion/.claude-plugin/plugin.json renamed to plugins/ui5-typescript-conversion/.github/plugin/plugin.json plugins/ui5-typescript-conversion/.claude-plugin/plugin.json renamed to plugins/ui5-typescript-conversion/.github/plugin/plugin.json

@@ -13,9 +13,9 @@
         "ui5",
         "sapui5",
         "openui5",
-        "claude",
         "plugin",
         "typescript",
         "conversion"
-    ]
+    ],
+    "skills": ["./skills/"]
 }

…i5-typescript-conversion/skills/SKILL.md …kills/ui5-typescript-conversion/SKILL.mdplugins/ui5-typescript-conversion/skills/SKILL.md renamed to plugins/ui5-typescript-conversion/skills/ui5-typescript-conversion/SKILL.md plugins/ui5-typescript-conversion/skills/SKILL.md renamed to plugins/ui5-typescript-conversion/skills/ui5-typescript-conversion/SKILL.md

@@ -13,11 +13,11 @@
         "ui5",
         "sapui5",
         "openui5",
-        "claude",
         "plugin",
         "linter",
-        "api documentation",
-        "development guidelines",
-        "best practices"
-    ]
+        "api-documentation",
+        "development-guidelines",
+        "best-practices"
+    ],
+    "skills": ["./skills/"]
 }

…ion/skills/references/test_conversion.md …conversion/references/test_conversion.mdplugins/ui5-typescript-conversion/skills/references/test_conversion.md renamed to plugins/ui5-typescript-conversion/skills/ui5-typescript-conversion/references/test_conversion.md plugins/ui5-typescript-conversion/skills/references/test_conversion.md renamed to plugins/ui5-typescript-conversion/skills/ui5-typescript-conversion/references/test_conversion.md

@@ -1,6 +1,8 @@
 {
-    "ui5-mcp-server": {
-        "command": "npx",
-        "args": ["-y", "@ui5/mcp-server"]
+    "mcpServers": {
+        "ui5-mcp-server": {
+            "command": "npx",
+            "args": ["-y", "@ui5/mcp-server"]
+        }
     }
 }

plugins/ui5/.claude-plugin/plugin.json plugins/ui5/.github/plugin/plugin.jsonplugins/ui5/.claude-plugin/plugin.json renamed to plugins/ui5/.github/plugin/plugin.json

@@ -15,12 +15,9 @@
         "openui5",
         "plugin",
         "linter",
-        "api documentation",
-        "development guidelines",
-        "best practices"
+        "api-documentation",
+        "development-guidelines",
+        "best-practices"
     ],
-    "skills": [
-        "./skills/ui5-best-practices",
-        "./skills/ui5-best-practices-integration-cards"
-    ]
+    "skills": ["./skills/"]
 }