Make the build readable without downloading anything

[correll]

The guide, the models and the photographs were all here; none of them rendered on GitHub. The manual was a PDF, the build photos were HEIC — which GitHub will not preview and Windows and Linux often will not open — and the STLs were twelve file names.

What changed

• Documentation/assembly.md — the assembly guide as Markdown with the figures inline, so it reads on a phone propped up next to the bench. The PDF stays as the printable version, and tools/extract_guide_figures.py cuts the figures out of it, so re-exporting the guide updates both rather than letting them drift.
• assembly_photos/ HEIC → JPEG, 63 MB down to 13 MB. The originals stay in history if a full-resolution frame is ever wanted back.
• Documentation/renders/ — every printed part rendered from its STL by tools/render_stl.py (numpy + Pillow, no CAD kernel): the V2 print set, and the four finger variants side by side. The base plate is rendered from its reverse face on purpose — the printed OpenRB-150 standoffs are the point of that part, and the default three-quarter view hides them.
• README — what the gripper is, what V2 changed, what to print, and where the software lives. Cross-linked with correlllab/MAGPIE, which gains the matching pointer back in Say what this hand is, and how to build one MAGPIE#2.
• MIT licence, matching the software repository. Without one, nobody could safely print from these models.
• The paper is in Documentation/paper/ and cited at the end of the README (recompressed from 17 MB to 1.5 MB; arXiv has the original).

One thing to check before merging

CAD/Base Top.stl and CAD/Base Bottom.stl are the same file, byte for byte, and it is the plate carrying the printed OpenRB-150 standoffs. Either V2 really does use one plate twice — in which case the BOM, which prices them separately, and the guide, which says they are different sizes, are stale — or the second export never made it in. Flagged in the README rather than guessed at.

Two smaller fixes while transcribing the guide: "Repeat Steps 2 through 5" → steps 2 to 4 (step 5 is that step), and "replace is roughness develops" → "replace if". Documentation/README.md also pointed at a Hardware/ folder that does not exist; the BOM lives in Documentation/.

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