chore(starship): reduce config to palette-only definition

Remove format string, character, directory, git, language, and utility
module configs — keep only the bru-espresso palette so users can apply
their own prompt layout on top.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kmf

tools/starship/bru-espresso.toml

@@ -7,9 +7,6 @@
 
 palette = "bru-espresso"
 
-format = """
-[☕ ](yellow)$directory$git_branch$git_status$ansible$kubernetes$python$golang$rust$nix_shell$cmd_duration$line_break$character"""
-
 [palettes.bru-espresso]
 bg       = "#1c1814"
 bg_soft  = "#26211c"
@@ -39,71 +36,3 @@ violet   = "#8762c6"
 blue     = "#0072d4"
 teal     = "#009c8f"
 green    = "#489100"
-
-[character]
-success_symbol = "[❯](yellow)"
-error_symbol = "[❯](red)"
-
-[directory]
-style = "blue bold"
-truncation_length = 3
-truncation_symbol = "…/"
-
-[git_branch]
-symbol = "  "
-style = "violet"
-format = "[$symbol$branch]($style) "
-
-[git_status]
-style = "yellow"
-format = "[$all_status$ahead_behind]($style) "
-conflicted = "⚑"
-ahead = "⇡${count}"
-behind = "⇣${count}"
-diverged = "⇕⇡${ahead_count}⇣${behind_count}"
-untracked = "?${count}"
-stashed = "≡"
-modified = "!${count}"
-staged = "+${count}"
-renamed = "»"
-deleted = "✘${count}"
-
-[ansible]
-style = "red"
-format = "[$symbol$version]($style) "
-
-[kubernetes]
-disabled = false
-symbol = "⎈ "
-style = "teal"
-format = "[$symbol$context:$namespace]($style) "
-
-[python]
-symbol = " "
-style = "green"
-format = "[$symbol$version]($style) "
-
-[golang]
-symbol = " "
-style = "teal"
-format = "[$symbol$version]($style) "
-
-[rust]
-symbol = "🦀 "
-style = "orange"
-format = "[$symbol$version]($style) "
-
-[nix_shell]
-symbol = "❄ "
-style = "blue"
-format = "[$symbol$state]($style) "
-
-[cmd_duration]
-min_time = 2000
-style = "fg_muted"
-format = "[$duration]($style) "
-
-[time]
-disabled = false
-style = "fg_muted"
-format = "[$time]($style)"