docs(demo): polish the dedup-is-not-epistemics blog draft

[mavaali]

Summary

Polishes the blog draft that shipped as a stub in #227, making it publish-ready for waglesworld.com.

• ContextVault section sourced: the pricing-as-inventory tell is now grounded in their live pricing page (tiers gated by memory count: 50 trial / 500 at $9.99 / 2,500 at $49.99 / unlimited Enterprise) instead of a placeholder.
• Critic-proofing: scope disclosure up front (langmem 0.0.30 is pre-1.0; the surrounding langgraph stack is post-1.0 and solid), conflict-of-interest disclosure (daftari is the author's project), extraction-instructions disclosure (their documented instructions parameter used; consolidation directives verbatim), and precise claims ("in both full runs, across three configurations" instead of "any run").
• PR invitation in the footer: show a LangMem configuration that catches the planted contradictions and a correction gets published with your name on it.
• Mihir's editorial pass synced from offline editing (softened opener, first-person framing, standalone "Price accordingly." kicker, daftari.dev link), with two mobile-editing typos fixed on sync-back.

Reviewer notes

• Doc-only change; no code touched.
• The draft intentionally concedes every point a critic could score first — version, prompt customization, run count, benchmarking-your-own-tool optics — leaving only the reproducible experiment to argue with.
• Style constraint honored: zero em dashes (verified), ~960 words.

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