[JacobStephens2]

Summary

 site/
 ├── index.html         # home page
+│                      #   og: and twitter: tags, absolute https://thirdshift.app URLs
+└── share-card.png     # 1200×630: headline over the press line
 docs/
+└── share-card/render.mjs   # renders the PNG from the page itself
 tests/
+└── share_card.rs      # tags complete, image served at the declared size
 Cargo.toml
-# homepage stays unset until thirdshift.app is live.
+homepage = "https://thirdshift.app"

/prompts/ doesn't exist yet, so only the home page is tagged. The README is untouched.

Evidence

Card (site/share-card.png, 1200×630):

• Before: cargo test --test share_card: 3 failed (the home page has no twitter:card, no og:type, …)
  After: cargo test --test share_card: 4 passed. cargo test --test packaging: 2 passed. The full cargo test passes.

share_card
  home page has og:type, url, site_name, title, description, image (+type/width/height/alt), all on https://thirdshift.app
  og:title == <title>, og:description == meta description
  twitter:card == summary_large_image; twitter title/description/image/alt == og's
  og:image resolves to a file under site/ that is a 1200×630 PNG, matching og:image:width/height

Merge Danger

Door: two-way

Tags, an image and a manifest field. All of it reverts cleanly. Platforms that already scraped the page may keep a cached card until they re-scrape.

Blast Radius: small

The home page's rendering is unchanged, since the tags live only in <head>. The crates.io page links to thirdshift.app from the next published release.

Unaddressed findings

Standards

• site() duplicates deploy_dir()'s CARGO_MANIFEST_DIR walk: only two copies exist, so it isn't worth a shared helper in tests/support/ yet.
• meta() takes a free-form attribute string: its only callers are the og() and twitter() wrappers, which fix the value.
• png_size's bare IHDR byte offsets, and 1200×630 written in both the test and the render script: the doc comment names the chunk. The test is the check that catches the two drifting apart.

Spec

• The render script is extra to "a static raster": kept so the card can be regenerated from the page. It needs playwright-core on NODE_PATH, as the script's header says.
• tests/share_card.rs wasn't asked for: kept, because it is how the acceptance criteria are checked.
• meta() depends on attribute order: the site's tags are hand-written in one shape. A reorder fails loudly rather than passing silently.

Closes #69

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