Merge the input-delivery fix from master

fix(input): deliver API prompts through tmux so their Enter is not lost

CLAUDE.md

@@ -131,7 +131,7 @@ Codeman is a Claude Code session manager with web interface and autonomous Ralph
 
 ## Common Gotchas
 
-- **Single-line prompts only** — `writeViaMux()` sends text+Enter separately; multi-line breaks Ink. ⚠️ **Input must END with `\r` or Enter is never sent**: `sendInput()` only issues `send-keys Enter` when the payload contains a carriage return, a `\r`-less `POST /api/sessions/:id/input` still succeeds (send-and-wait even reports `delivered:true`) while the text sits unsubmitted on the composer, and any `wait` burns its whole timeout on a turn that never started. Embedded newlines are stripped, not rejected, so `"echo A\necho B\r"` runs the joined `echo Aecho B`. ⚠️ **Claude Code 2.1.277+ ignores Enter for the first 30-50 s after the composer paints** while still taking the typed text (measured 2026-09-19: an Enter at 28 s stranded the prompt, one at 51 s submitted it), so text+`\r` sent at readiness sits unsent with `0 tokens` and a `wait` burns its timeout. So the SERVER verifies every programmatic write that carried a `\r`: `SubmitVerifier` (`session-submit-verifier.ts`, armed from `writeViaMux`) reads the pane on a 2 s to 60 s schedule and re-sends Enter only while the LAST composer line (the CLI's own `promptGlyph`) verifiably still holds the head of what was sent; an empty composer, other text, or no composer line at all (a shell, a direct-PTY session) ends it, and a newer write replaces the schedule. The skill's `sendwait` keeps its own copy of the loop (`_composer_text` in `skills/codeman/preamble.sh`) for servers that predate this. The `shift+tab` footer only means the composer painted, never that Enter is accepted
+- **Single-line prompts only** — `writeViaMux()` sends text+Enter separately; multi-line breaks Ink. ⚠️ **Input must END with `\r` or Enter is never sent**: `sendInput()` only issues `send-keys Enter` when the payload contains a carriage return, a `\r`-less `POST /api/sessions/:id/input` still succeeds (send-and-wait even reports `delivered:true`) while the text sits unsubmitted on the composer, and any `wait` burns its whole timeout on a turn that never started. Embedded newlines are stripped, not rejected, so `"echo A\necho B\r"` runs the joined `echo Aecho B`. ⚠️ **Claude Code 2.1.277+ ignores Enter for the first 30-50 s after the composer paints** while still taking the typed text (measured 2026-09-19: an Enter at 28 s stranded the prompt, one at 51 s submitted it), so text+`\r` sent at readiness sits unsent with `0 tokens` and a `wait` burns its timeout. So the SERVER verifies every programmatic write that carried a `\r`: `SubmitVerifier` (`session-submit-verifier.ts`, armed from `writeViaMux`) reads the pane on a 2 s to 60 s schedule and re-sends Enter only while the LAST composer line (the CLI's own `promptGlyph`) verifiably still holds the head of what was sent; an empty composer, other text, or no composer line at all (a shell, a direct-PTY session) ends it, and a newer write replaces the schedule. The skill's `sendwait` keeps its own copy of the loop (`_composer_text` in `skills/codeman/preamble.sh`) for servers that predate this. The `shift+tab` footer only means the composer painted, never that Enter is accepted. ⚠️ **A prompt must never be written into the pane as ONE burst**: Claude Code 2.1.283 takes a `<text>\r` burst of ~100+ chars as a paste, its `\r` lands as a NEWLINE and the prompt strands (a later raw `\r` does not recover it, a tmux `send-keys Enter` does). So `POST .../input` routes a plain prompt (`isPlainPromptInput()`, route-helpers.ts: printable text + exactly one trailing `\r`) through `writeViaMux` even without `useMux`, AWAITED so the browser's serialized POST fallback keeps frame order; raw frames and an explicit `useMux:false` keep the direct write
 - **ESM only** — Never `require()`, use `await import()`. `tsx` masks CJS/ESM issues in dev but production breaks
 - **Package ≠ product name** — npm: `aicodeman`, product: **Codeman**. Release renames tags accordingly. Both `aicodeman` and `codeman` bin aliases are installed (`package.json` `bin`)
 - **Global regex `lastIndex`** — Shared `g`-flag patterns in loops must reset `lastIndex = 0` first, or use the `execPattern()` helper in `utils/regex-patterns.ts` (resets automatically)