[EthanThatOneKid]

Closes #192.

Adds guides/rdf-objections, which answers three objections developers from SQL or a document store raise, with runnable examples:

• Is a missing fact false? Open vs closed world. An OPTIONAL query shows Sandra's missing email as unbound ("not recorded"), not "has none".
• Will a schemaless graph turn into a mess? Start without a schema, then add SHACL shapes once the model settles. It says plainly that Worlds does not validate writes yet and validation runs before import; on-write validation is planned in feat: validate every write against a world's SHACL shapes, on by default with a per-world opt-out worlds-sdk-ts#151.
• How does a schema change work? Add givenName/familyName beside name, read either shape with COALESCE, require the new shape for new data with a SHACL shape validated by a TypeScript script on rdf-validate-shacl (the wiki CLI's SHACL library), with Node.js, Deno, and Bun install commands, then backfill and retire name whenever you choose.

Left out deliberately

• Performance. The issue requires a published benchmark before any speed claim, and none exists yet (Proposal: head-to-head vs Tentris — implement WDBENCH / WatDiv / XAI / Footprint benchmarks sparql-engine#200 proposes one). Add the section once it ships.
• History and audit. Not described; the change log in Design an opt-in change log so Worlds keeps fact-level history worlds-sdk-ts#221 is parked.
• docs: clarify when RDF/SPARQL is justified over PostgreSQL for agent context #168 (when RDF is justified over Postgres) is still open, so there is no page to cross-link yet. The guide links the relational-databases comparison instead.

Verification

• Every code block was executed. I ran the page's literal jq | curl commands against QA (data-qa.wazoo.dev, host swapped; prod runs the same build) in a throwaway namespace, which was cleaned up afterwards. Every response shown on the page matches the QA output byte-for-byte after formatting.
• A script confirmed each .rq/.ttl block is identical to the file that was run.
• The validator's Node.js, Deno, and Bun commands were extracted from the formatted page and run unchanged in empty directories (Node 24.11, Deno 2.9.6, Bun 1.3.14). All three print the documented output and exit 1 for the old-shape record and 0 for the new one. pySHACL is mentioned only as an alternative conforming processor.
• pnpm run precommit and mintlify broken-links pass.
• Not observed: the page against prod, and how it renders in a Mintlify preview.

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