Rename MuGlyph to SharpMUTerm

[HarryCordewener]

Renames the project from MuGlyph to SharpMUTerm, associating it with the SharpMUSH
family and collapsing the three names the repo carried for one product (MuGlyph the
repo/product, MuClient.* the assemblies, muglyph the binary) onto one.

Targets claude/muglyph-implementation-5f51l3 rather than main, so PR #2 lands already
renamed instead of being renamed afterwards against 65 commits.

Why this name

Sharp = written in C#; MU = the worlds it connects to, generically (MUSH / MUCK / MUD --
it speaks plain telnet, so the narrower MUSH would both overclaim and read as a server);
Term = the terminal, which is the actual differentiator against
SharpClient.

Full rationale and the alternatives weighed: docs/superpowers/specs/2026-07-28-sharpmuterm-naming-design.md.

Commits

1. MuClient.* → SharpMUTerm.* -- purely mechanical: 10 project directories, their
   .csproj files, and the solution file, plus namespaces/usings/references (170 files).
2. Brand rename -- every human-visible surface, plus the behavioural renames below.
3. Design doc.

Reviewing commit 1 by skimming and commit 2 by reading is the intended split.

Behavioural changes

	Before	After
Binary	muglyph	sharpmuterm
Config	~/.config/MuGlyph/config.json	~/.config/SharpMUTerm/config.json
Env vars	MUGLYPH_GRAPHICS, MUGLYPH_SIXEL	SHARPMUTERM_GRAPHICS, SHARPMUTERM_SIXEL
User-Agent	MuGlyph/0.1	SharpMUTerm/0.1 (+ new repo URL)
Subset font	MuGlyphMonoNerd.woff	SharpMUTermMonoNerd.woff
Header chip	glyph	muterm
Solution	MuGlyph.slnx	SharpMUTerm.slnx

No published releases exist, so none of these carry compatibility shims. The config
directory is not migrated -- there was no ~/.config/MuGlyph on the machine this was done on,
but if you have one elsewhere: mv ~/.config/MuGlyph ~/.config/SharpMUTerm.

Also fixed in passing

Three stale docs found while touching them:

• Test count: 391 → 514 (README + CLAUDE.md).
• docs/PLAN.md said CI uses dotnet test; it uses dotnet run per test project, because
  TUnit on Microsoft.Testing.Platform dropped VSTest support in .NET 10.
• CLAUDE.md contradicted itself on that same point in two sections.

Verification

• dotnet build SharpMUTerm.slnx -c Release -- clean, 0 warnings, 0 errors.
• All five test projects, before and after: 514 passed, 0 failed (310 Core / 57 Graphics /
  42 Scripting / 15 Web / 90 Tui).
• dotnet publish -r linux-x64 produces a binary named sharpmuterm; --help and
  --snapshot both render correctly with no MuGlyph or glyph string surviving.
• git grep -i 'muclient\|muglyph' returns nothing.

Follow-ups (deliberately not in this PR)

• main-side assets. PR Add logo header to README + single-glyph icon font #3 added assets/fonts/MuGlyph.ttf and assets/fonts/README.md
  to main. They don't exist on this branch, so this rename can't reach them -- they need
  renaming on main after PR M5: MXP + Pueblo parsers, emoji, clickable links, packaging #2 merges.
• Logo. docs/logo.svg is an octagonal G, for Glyph -- a rationale that no longer
  applies. Left unchanged by choice; a caret-and-cursor mark in SharpMUSH's vocabulary was
  prototyped and deferred.
• Repo move. harryCordewener/MuGlyph → SharpMUSH/SharpMUTerm, to be done separately.

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[HarryCordewener]

CI: this PR targets PR #2's branch, and ci.yml only triggers on pull_request: branches: [main] — so no run was queued automatically. Dispatched it manually against rename/sharpmuterm via workflow_dispatch:

• build & test (ubuntu-latest): success
• build & test (windows-latest): success

Run: https://github.com/HarryCordewener/MuGlyph/actions/runs/30391875601

Worth considering separately: dropping the branches: [main] filter on the pull_request
trigger, so stacked PRs get CI without a manual dispatch. Left out of this PR since a rename
shouldn't change CI policy.