feat(update-automation): harden ui-summary contracts and selector matching

add strict schema-contract tests for checker/apply ui-summary payloads (exact key assertions for IDE consumers)
expand selector grammar to support exact:, prefix:, and regex: in both check and apply flows
add selector grammar test coverage, including invalid regex handling and include/exclude interactions
add a compact end-user update command reference to README with selector examples
validate with: npm run plugin:test-resource-updates

Author: Chris DiPesa

.github/plugin/update-index.json

@@ -41,6 +41,18 @@ npm run plugin:validate
 # Generate marketplace.json only
 npm run plugin:generate-marketplace
 
+# Generate update index used by update automation
+npm run plugin:generate-update-index
+
+# Check update status for installed .github resources
+npm run plugin:check-resource-updates
+
+# Apply updates safely (skip unknown drift by default)
+npm run plugin:apply-resource-updates
+
+# Force apply updates even when baseline is missing
+npm run plugin:apply-resource-updates:force
+
 # Create a new plugin
 npm run plugin:create -- --name <plugin-name>
 
@@ -164,6 +176,9 @@ When adding a new agent, instruction, skill, hook, workflow, or plugin:
 npm run plugin:validate
 npm run skill:validate
 
+# Validate update check/apply automation behavior
+npm run plugin:test-resource-updates
+
 # Build and verify README generation
 npm run build
 

AGENTS.md

@@ -45,6 +45,49 @@ copilot plugin marketplace add github/awesome-copilot
 copilot plugin install <plugin-name>@awesome-copilot
 ```
 
+## Update Commands
+
+Use these commands to check and apply updates for installed resources in `.github/agents`, `.github/instructions`, and `.github/skills`.
+
+```bash
+# Build or refresh the update index
+npm run plugin:generate-update-index
+
+# Check for updates (full JSON report)
+npm run plugin:check-resource-updates
+
+# Check for updates (IDE-oriented compact summary)
+npm run plugin:check-resource-updates:ui
+
+# Apply safe updates (skips unknown drift by default)
+npm run plugin:apply-resource-updates
+
+# Apply updates with compact IDE summary
+npm run plugin:apply-resource-updates:ui
+
+# Force apply when managed baseline is missing
+npm run plugin:apply-resource-updates:force
+```
+
+Selector examples:
+
+```bash
+# Only agents
+npm run plugin:check-resource-updates -- --include "type:agent"
+
+# Exact match
+npm run plugin:check-resource-updates -- --include "exact:agent/debug"
+
+# Prefix match
+npm run plugin:check-resource-updates -- --include "prefix:agent/"
+
+# Regex match
+npm run plugin:check-resource-updates -- --include "regex:^agent/(debug|janitor)$"
+
+# Exclude a known item while applying
+npm run plugin:apply-resource-updates -- --include "prefix:agent/" --exclude "exact:agent/debug"
+```
+
 ## Contributing
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) · [AGENTS.md](AGENTS.md) for AI agent guidance · [Security](SECURITY.md) · [Code of Conduct](CODE_OF_CONDUCT.md)