cc v1.0.3 -- hex editor + F3 pager editing hub

Claude Commander v1.0.3 — hex editor + the F3 pager becomes an editing hub

This release turns the F3 viewer into a place you can edit from, and ships a
new bundled hex editor.

New: CCHEXED.COM — a small overwrite-only hex editor

• Loads a file (up to 48 KB) and shows an offset / hex / ASCII grid with a byte cursor.
• Move with arrows, PgUp/PgDn, Home/End.
• Type hex digits to overwrite the byte under the cursor (high nibble, then low, auto-advancing).
• F2 writes the buffer back in place — the file size never changes (no insert/delete).
• Esc quits.

F3 pager: press E to edit

• In text mode, E opens the editor configured by editor = in cc.ini.
• In hex mode (toggle with H), E opens CCHEXED on the same file.
• cc reloads the file when the editor exits, so you see your changes immediately.

This mirrors how the [view] map already picks a viewer per file type: the
pager is now the hub, built-in modes (text, hex) render in place and each can
hand off to its matching editor.

Configurable editor (carried in from the prior change)

• editor = in cc.ini selects what F4 (and the pager's text-mode E) launches:
  CCEDIT (default), EDIT (DOS Editor), CCHEXED, or any editor on the PATH.

Notes

• dist/ now includes CCHEXED.COM; README and F1 help document the E key and editor = CCHEXED.
• The MIN build (no editor feature) is unaffected.

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