asdf

Squash the current repository state back into one baseline commit while
preserving the README reframing and repository contents.

Constraint: User explicitly requested a single squashed commit with subject "asdf"
Confidence: high
Scope-risk: broad
Reversibility: clean
Directive: This commit intentionally rewrites published history; coordinate before future force-pushes
Tested: git status clean; local history rewritten to one commit; force-pushed main to origin and instructkr
Not-tested: Fresh clone verification after push

src/components/PromptInput/inputModes.ts

@@ -0,0 +1,33 @@
+import type { HistoryMode } from 'src/hooks/useArrowKeyHistory.js'
+import type { PromptInputMode } from 'src/types/textInputTypes.js'
+
+export function prependModeCharacterToInput(
+  input: string,
+  mode: PromptInputMode,
+): string {
+  switch (mode) {
+    case 'bash':
+      return `!${input}`
+    default:
+      return input
+  }
+}
+
+export function getModeFromInput(input: string): HistoryMode {
+  if (input.startsWith('!')) {
+    return 'bash'
+  }
+  return 'prompt'
+}
+
+export function getValueFromInput(input: string): string {
+  const mode = getModeFromInput(input)
+  if (mode === 'prompt') {
+    return input
+  }
+  return input.slice(1)
+}
+
+export function isInputModeCharacter(input: string): boolean {
+  return input === '!'
+}