Merge pull request #670: fix(input): keep the line breaks of a multi-line mux prompt, pasted as one block

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/web/CLAUDE.md

@@ -70,7 +70,7 @@ Frontend JS modules have `@fileoverview` with `@dependency`/`@loadorder` tags. L
 
 **Shell keyboard accessory bar + one-shot Ctrl** (`keyboard-accessory.js`): a shell-mode session swaps the mobile accessory bar for terminal controls; `setMode()` records `extendedKeyboardBar` as the base layout and `refreshForActiveSession()` resolves base-vs-shell. ⚠️ Ctrl is a one-shot modifier applied in `terminal.onData` (after `shouldSuppressTerminalQueryResponse`, before every send path), and must skip `isTerminalFocusOrMouseReport()` chunks. ⚠️ It must disarm on use, second tap, any other accessory key, session switch, keyboard dismissal and layout swap. ⚠️ `_handleCjkInput()` must apply it too (the CJK textarea bypasses onData). Mapping: `ctrlByteFor()`. ⚠️ mobile.css's light-skin repaint must keep excluding `.accessory-btn:not(.armed)` or the armed state is invisible. → [architecture-invariants#shell-keyboard-accessory-bar-and-one-shot-ctrl](../../docs/architecture-invariants.md#shell-keyboard-accessory-bar-and-one-shot-ctrl)
 
-**Mobile prompt composer** (`keyboard-accessory.js`): the agent bars' Paste key is **Compose**, a native multiline dialog where only **Send** submits (the shell bar keeps plain Paste). Opening it adopts the whole terminal prompt (`_takePendingLocalEcho`), erasing the flushed prefix with backspaces counted in code points. ⚠️ Drafts are per-session and in memory only (`_composerDrafts`), never persisted (prompts carry secrets). ⚠️ Delivery is a hand-built bracketed-paste frame via `_sendInputAsync` WITHOUT `useMux`, then a separate delayed Enter WITH it; never `terminal.paste()`, and the frame must never take the mux fallback (it strips newlines). ⚠️ `_composerMaxLength` must stay derived from `MAX_INPUT_LENGTH` minus the markers, or an oversized frame wedges the durable queue. ⚠️ The composer overlay needs its own gutter restatement after the fold rules. Test: `test/mobile-prompt-composer.test.ts`. → [architecture-invariants#mobile-prompt-composer](../../docs/architecture-invariants.md#mobile-prompt-composer)
+**Mobile prompt composer** (`keyboard-accessory.js`): the agent bars' Paste key is **Compose**, a native multiline dialog where only **Send** submits (the shell bar keeps plain Paste). Opening it adopts the whole terminal prompt (`_takePendingLocalEcho`), erasing the flushed prefix with backspaces counted in code points. ⚠️ Drafts are per-session and in memory only (`_composerDrafts`), never persisted (prompts carry secrets). ⚠️ Delivery is a hand-built bracketed-paste frame via `_sendInputAsync` WITHOUT `useMux`, then a separate delayed Enter WITH it; never `terminal.paste()`, and the frame must never take the mux fallback (`TmuxManager.sendInput()` strips every `\r`, the frame's line separator, so the lines weld into one inside a second pair of markers and get submitted). ⚠️ `_composerMaxLength` must stay derived from `MAX_INPUT_LENGTH` minus the markers, or an oversized frame wedges the durable queue. ⚠️ The composer overlay needs its own gutter restatement after the fold rules. Test: `test/mobile-prompt-composer.test.ts`. → [architecture-invariants#mobile-prompt-composer](../../docs/architecture-invariants.md#mobile-prompt-composer)
 
 **Terminal resilience**: a replay clear is the queued in-stream `\x1bc` in `_resetTerminalForReplay()`, never `reset()`/`clear()` (queued bytes fuse into the snapshot); the renderer watchdog `_kickRenderer()` reads xterm privates, pinned by `test/xterm-private-api.test.ts` against the resolved lockfile version; every terminal capture fetch has a deadline that covers the BODY (`_fetchTerminalCapture`). → [architecture-invariants#terminal-resilience-replay-clears-renderer-liveness-fetch-deadlines](../../docs/architecture-invariants.md#terminal-resilience-replay-clears-renderer-liveness-fetch-deadlines)
 

src/web/public/app.js

@@ -3938,8 +3938,8 @@ class CodemanApp {
     // Both transports refuse a frame over the server's limit (issue #484), and a
     // refused frame used to sit at the head of the durable queue for good. So an
     // oversized paste goes out as several in-limit frames, delivered in seq order
-    // as one contiguous stream. A mux write is line-oriented (it strips newlines
-    // and sends Enter on its own), so it is never split: refuse it instead.
+    // as one contiguous stream. A mux write is one paste that sends Enter on its
+    // own, so it is never split: refuse it instead.
     const limit = window.CodemanInputLimit;
     if (limit && input.length > limit.FRAME_MAX_CHARS) {
       if (useMux || input.length > limit.PASTE_MAX_CHARS) {

src/web/public/keyboard-accessory.js

@@ -1432,9 +1432,10 @@ const KeyboardAccessoryBar = {
     overlay.querySelector('.prompt-composer-terminal').addEventListener('click', () => {
       // Hand the text BACK to the terminal prompt so both surfaces hold the same
       // prompt, the mirror of the adoption composePrompt() does on open. Only a
-      // single-line draft can make the trip: the prompt transport is single-line
-      // and strips embedded newlines, so a multi-line draft would arrive mangled
-      // and instead stays parked as a draft (the dot on the Compose key shows it).
+      // single-line draft can make the trip: the terminal prompt is one line and
+      // its text reaches the PTY as typed input, where an embedded newline is a
+      // key, so a multi-line draft would arrive mangled and instead stays parked
+      // as a draft (the dot on the Compose key shows it).
       const text = textarea.value;
       if (!text || text.includes('\n')) {
         close({ focusTerminal: true });

src/web/schemas.ts

@@ -1905,7 +1905,7 @@ export const ScheduledRunSchema = z.object({
 /** 'HH:MM' 24-hour time. */
 const hhmmSchema = z.string().regex(/^([01]?\d|2[0-3]):[0-5]\d$/, 'Time must be HH:MM (24-hour)');
 
-/** Prompt delivery is single-line only (writeViaMux/Ink constraint) — reject newlines outright. */
+/** Prompt delivery is single-line only (the submit check cannot reliably recognise a multi-line paste) — reject newlines outright. */
 const noNewlines = (v: string) => !/[\r\n]/.test(v);
 
 /** Shared field shape for creating/updating a scheduled job. */