Render configuration-cache status in the caching Job Summary (#989)

Render the configuration-cache restore-state in the caching Job Summary,
driven by the new `CacheReport.configurationCache` field produced by the
`gradle-actions-caching` provider.

## What's here

- `cache-service.ts`: add a `ConfigurationCacheStatus` type
(`not-active` / `restored` / `not-restored` / `restore-incomplete`) and
an optional `configurationCache` field on `CacheReport`.
- `caching-report.ts`: a `CONFIG_CACHE_COPY` map and a prominent status
line in `renderCachingReport`, beside the cleanup line. The `not-active`
case links to the `#cache-encryption-key` docs.

## Cross-repo dependency

The field is populated by gradle/actions-caching PR #75 ("Restore
configuration-cache support for simple builds"). This rendering compiles
independently (it uses this repo's own `CacheReport` type) and renders
nothing until the vendored `gradle-actions-caching` bundle is refreshed
from that branch — so this should land with/after the vendor refresh.

## Verification

`npm run check` clean; full Jest suite (366 tests) passes, including 3
new rendering tests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

sources/src/caching-report.ts

@@ -1,4 +1,4 @@
-import {CacheCleanupStatus, CacheEntryReport, CacheReport, CacheStatus} from './cache-service'
+import {CacheCleanupStatus, CacheEntryReport, CacheReport, CacheStatus, ConfigurationCacheStatus} from './cache-service'
 
 const DOCS = 'https://github.com/gradle/actions/blob/main/docs/setup-gradle.md'
 const DISTRIBUTION = 'https://github.com/gradle/actions/blob/main/DISTRIBUTION.md'
@@ -28,6 +28,13 @@ const CLEANUP_COPY: Record<CacheCleanupStatus, string> = {
     'disabled-readonly': `[Cache cleanup](${DOCS}#configuring-cache-cleanup) is always disabled when the cache is read-only.`
 }
 
+const CONFIG_CACHE_COPY: Record<ConfigurationCacheStatus, string> = {
+    'not-active': `Configuration cache state was not cached — set a [cache-encryption-key](${DOCS}#cache-encryption-key) to enable configuration-cache caching.`,
+    restored: `Configuration cache state was restored from the cache.`,
+    'not-restored': `Configuration cache state was not restored — no cached data was available (e.g. the first run for this cache key).`,
+    'restore-incomplete': `Configuration cache state was not restored — the Gradle User Home was not fully restored.`
+}
+
 /**
  * Renders a cache report into the unified Job Summary markdown, with a consistent
  * skeleton across every variant: a section heading, a status line, an integrated
@@ -69,6 +76,10 @@ function renderCleanupLine(cleanup?: CacheCleanupStatus): string | undefined {
     return cleanup ? CLEANUP_COPY[cleanup] : undefined
 }
 
+function renderConfigCacheLine(configurationCache?: ConfigurationCacheStatus): string | undefined {
+    return configurationCache ? CONFIG_CACHE_COPY[configurationCache] : undefined
+}
+
 function renderProviderNote(providerNote?: ProviderNote): string | undefined {
     if (!providerNote) {
         return undefined
@@ -88,9 +99,10 @@ function renderDetails(report: CacheReport): string {
         : `Entries: ${restored} restored, ${saved} saved - Expand for more details`
 
     const cleanup = report.status === 'enabled' ? renderCleanupLine(report.cleanup) : undefined
+    const configCache = renderConfigCacheLine(report.configurationCache)
     const table = renderEntryTable(report.entries)
     const pre = `<pre>\n${renderEntryDetails(report.entries)}</pre>`
-    const body = [STATUS_COPY[report.status], cleanup, table, pre].filter(Boolean).join('\n\n')
+    const body = [STATUS_COPY[report.status], cleanup, configCache, table, pre].filter(Boolean).join('\n\n')
 
     return `<details>
 <summary>${summary}</summary>