fix: v0.5.0 security and robustness fixes from the 2026-10-07 review

- Ask Claude: strip control characters, send as bracketed paste (closes #2)
- end: forget before kill, so ending from inside a session leaves no ghost (closes #3)
- reconnects use `attach --existing` and never resurrect ended/renamed sessions (closes #4)
- repo: git --no-optional-locks, no safe.directory override, refresh on connect/bell/60s (closes #5)
- uploads: unique names via mktemp, cleanup trap on hangup (closes #6)
- clipboard: write-only OSC 52 provider, tmux allow-passthrough off (closes #7)
- uploads: size check up front, streamed slices, idle timeout (closes #9)
- --list: path last in TSV rows, tolerant numbers (closes #10)
- tokens via curl config on stdin; userinfo stripped from remote URLs (closes #11)
- ttyd max clients 32 and at most 2 concurrent side-channel calls (#8; BroadcastChannel polling still open)
- tmux: fixed terminal-features index (no duplicates on re-source), no status-right clock

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/protocol.test.mjs

@@ -2,7 +2,7 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import {
   Client, FlowControl, decodeServer, encodeBinaryInput, encodeInit, encodeInput, encodeResize,
-  parseListOutput, parseTitle, sessionFromSearch, slugify, stripAnsi, tokenUrl, wsUrl,
+  parseListOutput, parseTitle, pasteSafe, sessionFromSearch, slugify, stripAnsi, tokenUrl, wsUrl,
 } from '../web/src/protocol.js';
 
 const text = (bytes) => new TextDecoder().decode(bytes);
@@ -80,3 +80,9 @@ test('flow control pauses after highWater pending writes and resumes below lowWa
   assert.equal(flow.release(), null); // 1
   assert.equal(flow.release(), Client.RESUME); // 0
 });
+
+test('untrusted text loses control characters before it is typed (#2)', () => {
+  assert.equal(pasteSafe('ok\nrm -rf /\r\x1b[31mred\x07'), 'ok rm -rf / [31mred ');
+  assert.equal(pasteSafe('plain text'), 'plain text');
+  assert.equal(pasteSafe(null), '');
+});