Finish the SharpMUTerm rename: README title, icon font, generator

[HarryCordewener]

Four files landed on main still carrying the old name. They were added by PR #3, which
branched before the rename existed, so the rename PR could not reach them.

The visible one: the repository front page announced MuGlyph in its <h1>, two lines above
a paragraph describing SharpMUTerm.

Changes

File	What
README.md	<h1> title and logo alt text
assets/fonts/MuGlyph.ttf → SharpMUTerm.ttf	Renamed and regenerated
assets/fonts/README.md	Document text
tools/make-glyph-font.py	Output path, GLYPH_NAME, family and PostScript names

Why the font is regenerated, not just renamed

A git mv leaves the old identity inside the binary. Before:

nameID 1 = MuGlyph
nameID 6 = MuGlyph-Regular
glyph order: ['.notdef', 'muglyph']

After regenerating through the fixed tools/make-glyph-font.py:

nameID 1 = SharpMUTerm
nameID 6 = SharpMUTerm-Regular
glyph order: ['.notdef', 'sharpmuterm']
cmap: ['0xe000']

Anyone merging this into their terminal font would otherwise have seen the old family name.

Verification

• Regenerated font reports 2 contours at U+E000, matching the two <path> elements in
  docs/logo.svg.
• Rendered the glyph out of the built .ttf and confirmed it matches docs/logo.svg — correct
  shape and orientation (the generator flips the Y axis, since SVG is Y-down and fonts are Y-up).
• git grep -i muglyph over README.md, assets/, and tools/ returns nothing.
• No code changed — src/ and tests/ are untouched, so the 514 tests are unaffected.

Also checked while surveying main, and found correct — no changes needed: docs/PACKAGING.md
(publish profiles exist at the paths it names), docs/SCREENSHOTS.md (the piping form it
documents is genuinely supported by ansi_frame_to_image.py), .github/workflows/release.yml
(artifact names), the snapshot → SVG pipeline end to end, and every relative link across all
tracked Markdown files.

The remaining old-name references are in docs/HANDOFF.md, covered by #5, and in
docs/superpowers/specs/2026-07-28-sharpmuterm-naming-design.md, where they are the subject
matter and correct to keep.

🤖 Generated with Claude Code

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between fa8479c and 9049966.

⛔ Files ignored due to path filters (2)

• assets/fonts/MuGlyph.ttf is excluded by !**/*.ttf
• assets/fonts/SharpMUTerm.ttf is excluded by !**/*.ttf

📒 Files selected for processing (3)

• README.md
• assets/fonts/README.md
• tools/make-glyph-font.py

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