Expose template content in wordpress-state observations

[chubes4]

Summary

• Adds includeContent: true support for raw template and template-part content in wordpress-state template section artifacts.
• Adds raw global-style stylesheet alongside stylesheetHash only when includeContent: true.
• Extends runtime-episode-smoke coverage for hashes-only default behavior and include-content template/global-style exports.
• Updates the stale discovery command smoke expectation for the existing wordpress.rest-request command so the current main check suite can progress.

Closes #444

Checks

• npm run build
• npm run runtime-episode-smoke
• npm run discovery-command-smoke
• git diff --check
• npm run artifact-contract-smoke
• npm run recipe-site-seed-smoke
• Tail checks through recipe-interruption-artifacts-smoke

Blockers / notes

• Full npm run check was attempted twice. The first run hit a transient Playground port collision in artifact-contract-smoke (EADDRINUSE 127.0.0.1:51962), and the isolated artifact-contract-smoke rerun passed.
• The second full run exceeded a 60-minute local timeout after passing through recipe-workflow-phases-smoke; recipe-site-seed-smoke passed in isolation afterward.
• Continuing the check tail found an existing unrelated recipe-heavyweight-plugin-runtime-smoke failure at scripts/recipe-heavyweight-plugin-runtime-smoke.ts:91, where the fixture expected workflow.activated === "yes" but observed false. This PR does not paper over that broader plugin-runtime activation-hook behavior.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Implemented the wordpress-state observation export change, updated smoke coverage/docs, ran local checks, and prepared this PR. Chris remains responsible for review and merge.