better cache

openspec/changes/archive/2026-02-10-better-cache/specs/wordpress-content-source/spec.md

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+## MODIFIED Requirements
+
+### Requirement: Build-time caching
+WordPress posts, pages, and categories MUST be written into the repo-local content cache used by the site build.
+
+If the WordPress fetch fails, the system MUST NOT crash the entire build pipeline; it MUST either:
+- keep the last-known-good cached WordPress content (if present), or
+- store an empty WordPress dataset and allow the rest of the site to build.
+
+When the cache layer is configured and reachable, the WordPress ingestion MUST cache `wp-json` responses (or normalized outputs) using a TTL so repeated ingestion runs avoid unnecessary network requests and parsing work.
+
+#### Scenario: WordPress fetch fails
+- **WHEN** a WordPress API request fails
+- **THEN** the site build can still complete and the blog surface renders a graceful empty state
+
+#### Scenario: Cache hit avoids wp-json refetch
+- **WHEN** WordPress ingestion is executed within the configured cache TTL
+- **THEN** it uses cached data instead of refetching from `wp-json`
+