fix(startup): reorganize HUD stats panel layout

[aporcelli]

Summary

Reorganizes the startup HUD stats panel so information is grouped more intuitively and every pixel column is used efficiently. No more wasted real estate.

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Visual change

Before (current main)

Wide terminal — 5 rows, VER eats an entire row for one number:

GIT:  On branch main            PATH: /home/user/project
MCP:  2 server(s)              PLUGINS: 8 package(s)
AGENTS:  6 phases               EXTENSIONS: 7 active
SKILLS:  45 loaded              TOOLS: 3 custom
VER:   v1.2.3

Narrow terminal — PATH comes after GIT (backwards for navigating), VER buried in the middle:

GIT:  On branch main
PATH: /home/user/project
MCP:  2 server(s)
PLUGINS:  8 package(s)
AGENTS:  6 phases
SKILLS:  45 loaded
EXTENSIONS:  7 active
VER:   v1.2.3
TOOLS:  3 custom

After (this PR)

Wide terminal — 4 compact rows, VER sits on the right of the first row where it belongs (you always glance top-right for a version number):

PATH: /home/user/project      EXTENSIONS: 7 active      VER: v1.2.3
GIT:  On branch main          PLUGINS: 8 package(s)
MCP:  2 server(s)             SKILLS: 45 loaded
AGENTS:  6 phases             TOOLS: 3 custom

Narrow terminal — PATH comes first (you want to know WHERE you are before which BRANCH), VER at the bottom:

PATH: /home/user/project
GIT:  On branch main
MCP:  2 server(s)
PLUGINS:  8 package(s)
AGENTS:  6 phases
SKILLS:  45 loaded
EXTENSIONS:  7 active
TOOLS:  3 custom
VER:   v1.2.3

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What changed (code)

• addWideRow — now accepts an optional 3rd label/value pair (l3, v3). This lets the first row carry VER on the right without needing a dedicated row. The function stays backward-compatible: existing 4-arg calls still work unchanged.
• Wide pairings reordered for logical grouping: PATH + EXTENSIONS + VER, GIT + PLUGINS, MCP + SKILLS, AGENTS + TOOLS
• Narrow order — PATH first (where you are, visually primary), VER last (status line, visually secondary)
• Column widths — slimmed down to fit 3 columns in wide mode without clipping or line wrap

What did NOT change

• ✅ CLI/tty guards — preserved exactly as in main
• ✅ Terminal-size mode selection (full/minimal/skip) — untouched
• ✅ Resize handling — untouched
• ✅ Rose/logo rendering, animation, glint, sparkle — untouched
• ✅ Banner config commands (/gentle:banner, /gentle:toggle-rose, etc.) — untouched
• ✅ No new commands, shortcuts, or state — nothing added

Test plan

• All 30 existing unit tests pass
• Runtime harness passes
• Brace balance verified (0 diff)
• Only extensions/startup-banner.ts changed
• Diff is +23/−34 lines, all inside the stats panel layout section