fix(agents): raise claude tui startup wait to 60s

src/beaver_gateway/agents/claude.py

@@ -153,14 +153,19 @@ class ClaudeCodeOptions(BaseModel):
     caveats) as ``UserMessage`` events. Off by default — they're not
     part of the real conversation."""
 
-    startup_delay: float = 10.0
+    startup_delay: float = 60.0
     """Upper bound (seconds) on waiting for claude's TUI to enable
     bracketed-paste mode after spawn. claude-code-api polls PTY output
-    for the DECSET 2004 marker and returns as soon as it arrives; this
-    caps how long to wait if it never does. 10s by default is a free
-    headroom — on a fast host the marker arrives in well under a second
-    and we proceed immediately — but it saves slow hosts (Raspberry Pi
-    etc) where the TUI can take a few seconds to render."""
+    for the DECSET 2004 marker and returns as soon as it arrives, so a
+    generous cap costs nothing on a warm host — it only bounds the case
+    where the marker never shows.
+
+    It has to be generous, because timing out here means writing the
+    prompt into a terminal that hasn't enabled bracketed paste, where our
+    ``ESC[200~`` framing is parsed as junk and the message is silently
+    dropped. Observed on a cold Raspberry Pi: 10s elapsed with *zero*
+    bytes of PTY output, the prompt went into the void, and the turn hung
+    until a human typed into the session by hand."""
 
     file_wait_timeout: float = 30.0
     """How long to wait for the session JSONL to appear after spawn.