One firmware: the Debug Console in every build, off until switched on, with the device's own token

There is no Debug Build any more (ADR 0010, issue #68, Q188 to Q195). The
console and the test commands are compiled into every firmware. It listens
only while Settings > Debug Console is on, which isn't the default; off,
neither its task nor its 4 KB ring exists. The token is made by the device
and shown on that page; a client proves it knows it by answering a challenge
with an HMAC, so it never crosses the network, and five wrong answers close
the console for a minute. DBG in the Status Bar while it listens.

Over USB serial only: debug on, debug token <value>, debug token new.
scripts/flash.sh --debug uses them to set a device up with the developer's
token. scripts/rdbg.py takes the token from -t, $RORO_DEBUG_TOKEN or the
file, answers the challenge, and fetches a release's ELF to decode a crash.

Gone: the cardputer-adv-debug environment, RORO_DEBUG, the +debug version,
scripts/debug_flags.py, update install ... force, and the rule that a Debug
Build doesn't install releases. Old clients and old firmwares don't talk to
each other.

Against the builds it replaces: 30 KB more flash and 88 bytes more static
RAM than the release, 4 KB less RAM than the Debug Build. 468 host tests.
Checked on the device: off by default, login, the pause after wrong tokens,
Safe Mode with the console, the setting surviving an update, debug off.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT

src/services/radio_service.cpp

@@ -190,7 +190,6 @@ void RadioService::store(RadioPacket& p) {
     lastPacketMs_ = p.ms;
 }
 
-#ifdef RORO_DEBUG
 void RadioService::debugAntenna(bool on) {
     auto& i2c = M5.In_I2C;
     uint8_t out = i2c.readRegister8(kExpander, kOutput, kI2cFreq);
@@ -208,7 +207,6 @@ void RadioService::inject(const uint8_t* data, size_t len, float rssi, float snr
     store(p);
     console.printf("lora inject: #%lu, %u B\n", (unsigned long)p.seq, p.len);
 }
-#endif
 
 // Continuous receive. Only RX done raises DIO1; preambles and headers are only recorded in the
 // IRQ status, which sampleNoise() reads.