docker: stop the wrapper typing into live sessions, and support per-agent logins

Both agents stopped, and the decoder diagnosed it itself:

  "I received '2' and '1' but I don't have a pending question those would
   answer -- I was in the middle of setting up the /loop cron job."

claude-autonomous matched the BARE SUBSTRINGS 'Choose', 'trust' and 'accept' to
answer Claude Code's one-time first-run gates. The /loop prompt is echoed into
the terminal, and that day's briefs contain 'accepted as-is' and 'least
trustworthy' -- so expect matched the agent's OWN INSTRUCTIONS and typed 2\r and
1\r into a running session, which then sat waiting for a human to explain them.

The old comment argued a multi-word pattern 'never matches' because the gate
text wraps. True of a literal string, false of a whitespace-tolerant regex, which
is what these now are: \s+ spans the wrap, and the terminal is 200 columns wide.

Measured, old against new, against the real brief text and a real gate:

  {accept}                     brief 0  gate 1   (case-sensitive; briefs say 'accepted')
  {Yes,\s*I\s+accept}          brief 0  gate 1
  {trust}                      brief 1  <- the trigger
  {Do\s+you\s+trust\s+the\s+files} brief 0

Two defences, because one is not enough for something that can type: patterns
prose cannot match, and gates skipped ENTIRELY on resume (SYLPH_SKIP_GATES) --
a resumed session cannot show a first-run gate, so there is nothing to answer
and everything to lose. Timeout cut 90s -> 25s for the same reason.

Also: SYLPH_OWN_LOGIN. Remote Control stopped registering under the long-lived
token, and the likely reason is scope -- `claude auth login` requests
user:sessions:claude_code and the token's auth status reports no email, org or
subscription. A per-agent `claude auth login` restores Remote Control AND avoids
the rotation collision, because each agent holds its own grant rather than a copy
of one. The flag stops the entrypoint seeding the host's credentials over it.

docker/decoder/sylph-decoder

@@ -206,6 +206,12 @@ docker_args() {
   # Claude Code to empty, so both halves of the failure are gone.
   #
   # Inert until the file exists: without it the OAuth path below is unchanged.
+  # Pass through: set SYLPH_OWN_LOGIN=1 when this container has run
+  # `claude auth login` itself, so the entrypoint never copies the host's
+  # rotating credentials over its own grant. Remote Control needs a real
+  # login -- the long-lived token does not carry the sessions scope.
+  [ -n "${SYLPH_OWN_LOGIN:-}" ] && _out+=(-e "SYLPH_OWN_LOGIN=$SYLPH_OWN_LOGIN")
+
   CLAUDETOK="${SYLPH_CLAUDE_TOKEN:-$HOME/.sylph-claude-token}"
   if [ -f "$CLAUDETOK" ]; then
     _out+=(-e "CLAUDE_CODE_OAUTH_TOKEN=$(tr -d '[:space:]' < "$CLAUDETOK")")