chore(todo): answer + close completion-icon face investigation

1 files changed, 18 insertions, 4 deletions

diff --git a/todo.org b/todo.org
index ed021cca8..968671f77 100644
--- a/todo.org
+++ b/todo.org
@@ -68,10 +68,24 @@ yields. Archiving gptel this session freed the =C-; a= prefix, so the whole
 ai-term family could live under =C-; a= (or another near-home-row key).
 Related: the s-F9 detached-agent landing task and the tmux copy-mode binding
 task elsewhere in this section. From the roam inbox.
-** TODO [#C] Face coloring completion-read icons :quick:solo:
-Identify which face colors the icons shown in completing-read (the
-nerd-icons-completion / marginalia icons) in this config, so the icon color can
-be themed. From the roam inbox.
+** DONE [#C] Face coloring completion-read icons :quick:solo:
+CLOSED: [2026-06-23 Tue]
+Answered 2026-06-23 (investigation, no code change). There is no single
+"completion icon" face — each icon inherits a per-type =nerd-icons-*= color
+face (a .el file icon inherits =nerd-icons-purple=, an M-x command icon
+=nerd-icons-blue=, etc.; nerd-icons picks the face per glyph/filetype). What
+makes every completion icon render the SAME color here is this config's bulk
+tint: =cj/nerd-icons-tint-color= (defcustom in =nerd-icons-config.el=, default
+"darkgoldenrod") sets the foreground of all ~33 =nerd-icons-*= color faces via
+=cj/nerd-icons-apply-tint=, applied in the =nerd-icons= =:config=. Verified live:
+=nerd-icons-icon-for-file "init.el"= -> =:inherit nerd-icons-purple=, and that
+face's foreground is "darkgoldenrod". Directory icons additionally get
+=nerd-icons-yellow= layered on by =cj/--nerd-icons-color-dir= advice
+(=nerd-icons-completion-dir-face= is unset, so it isn't the driver here).
+To theme: change =cj/nerd-icons-tint-color= (one color for all icons, then call
+=cj/nerd-icons-apply-tint=), or drop the bulk tint and set the individual
+=nerd-icons-*= color faces for per-filetype colors. For theme-studio, the knob
+to expose is =cj/nerd-icons-tint-color= plus the =nerd-icons-*= face family.
 ** DONE [#C] Org formatting inside cj comments :feature:
 CLOSED: [2026-06-23 Tue]
 Done 2026-06-23: mapped the "cj:" src-block language to org-mode via