docs: close remaining Agent Ready warnings

[Videirafo]

Closes #29

Changes

• adds last_updated to the canonical Markdown frontmatter;
• adds a public /glossary page and /glossary.md mirror with canonical/alternate discovery;
• links glossary terminology from the Playground, sitemap and llms.txt;
• increases useful static HTML text to move the root page above the Agent Ready text-density recommendation;
• adds tests for glossary discovery and the remaining scanner-critical contracts.

Invariants preserved

• no change to tool-policy semantics;
• no change to tenant isolation, approval, or audit behavior;
• no secrets, LLM provider, or external database introduced;
• public Render URL remains canonical.

Baseline

Agent Ready before this PR: 93/100, Site 15/15, Page 22/25, llms.txt 100/100, accessibility 100/100.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add the glossary to the XML sitemap

When a crawler follows the sitemap advertised by ROBOTS_TXT, this addition is absent because it updates only SITEMAP_MD, while SITEMAP_XML still contains just the root URL. Machine sitemap consumers therefore do not receive the new indexable canonical /glossary page; add a corresponding <url> entry to the XML sitemap and cover it in the sitemap test.

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