docs(graph): rework the @ttsc/graph guide, README, and launch post

[samchon]

Intent

Rework the @ttsc/graph documentation set so each surface has one job and stops duplicating the others: the launch post owns the story, the guide owns the reference, the README is a lean landing.

Scope

• Guide pages (website/src/content/docs/graph/): merged the Tools reference into Design (inline ITtscGraphApplication plus a type-source tab set for the branch and payload types), added a sourced Comparison page (matrix + summary benchmark chart + per-tool source links), and restructured every page into a numbered H2/H3 hierarchy matching the launch post. Embedded the summary benchmark chart on the Overview page. Updated _meta.ts (Overview → Design → Comparison → 3D Viewer).
• Benchmark (benchmark/graph.mdx): slimmed to the chart, result commentary, and reproduce steps; the tool contract now links to Design and the head-to-head to Comparison.
• README: rewritten as a lean landing focused on @ttsc/graph itself (install, connect, how it works, benchmark, 3D). The competitor autopsy and narrative move to the launch post and Comparison guide. Banner switched to the graph OG image; broken launch-post and image links fixed.
• Launch post: replaced em-dashes with colons (house style) in the pain/antidote table and the request-type list.

Notes / deferred

• Competitor facts (especially serena) are sourced to each tool's own repo and docs as of mid-2026 and flagged as moving targets; they live only in Comparison to avoid double-maintenance.
• benchmark/graph.mdx intentionally keeps flat headings, matching its sibling benchmark pages.
• The Design page's inline ITtscGraphApplication shows the IDraft shape landing with the pending source PR; the live LocalSource tabs follow the source.

Test plan

• prettier run on all changed files (blog and Comparison table normalized; the rest unchanged).
• Verified: no em-dashes across the graph docs and README, all cross-links resolve (no leftover /docs/graph/tools or /docs/graph/comparison), Design type-source tabs balanced (11 items and 11 panels), the #3-sources anchor matches its heading.
• Website MDX build validated by CI (not runnable locally).

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR reorganizes the @ttsc/graph documentation so each surface has a distinct purpose (guide as reference, README as landing, launch post as narrative) while removing duplicated content and adding a sourced comparison page.

Changes:

• Replaced the old “Tools” guide with a new “Design” reference page, and added a new “Comparison” page (including an embedded summary benchmark chart).
• Updated the Graph docs overview + viewer pages to match the numbered heading structure and to embed the summary benchmark chart on the overview.
• Slimmed the benchmark page, refreshed the package README as a lean landing, and applied the colon-style edits in the launch post.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
website/src/content/docs/graph/viewer.mdx	Adds numbered sections/subsections and clarifies viewer usage (run vs dump) and interpretation guidance.
website/src/content/docs/graph/tools.mdx	Removes the former Tools reference page (content migrated/restructured into Design).
website/src/content/docs/graph/index.mdx	Embeds the summary benchmark chart and updates navigation/structure to point to Design + Comparison.
website/src/content/docs/graph/design.mdx	New consolidated reference/design page including request/result contract explanation and live type-source tabs.
website/src/content/docs/graph/compare.mdx	New sourced comparison page with a matrix + embedded summary benchmark chart + source links.
website/src/content/docs/graph/_meta.ts	Updates the docs sidebar order/entries (Overview → Design → Comparison → 3D Viewer).
website/src/content/docs/benchmark/graph.mdx	Slims benchmark documentation to chart + interpretation + reproduce steps, linking out to Design/Comparison/launch post.
website/src/content/blog/i-made-ts-compiler-graph-mcp.mdx	Applies the house-style colon formatting in the pain/antidote table and request-type list.
packages/graph/README.md	Rewrites README as a lean landing page (install/connect/how it works/benchmark/3D) and updates banner/link targets.

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