feat: graft pyxis onto upstream microReticulum 0.4.1

Repins microReticulum + microLXMF onto the upstream-0.4.1 graft and adapts
pyxis to the new src/microReticulum/ layout and 0.4.x APIs. The far-diverged
0.3.0 fork's Resource/Transport/Identity work is subsumed by upstream's
reimplementation; only the still-needed fixes ride on the pinned branches
(PKCS7/HMAC/X25519 crypto -- proven byte-identical to python RNS 1.3.1 --
Packet link-proof callback, Identity short-sig guard, and the bz2 layer +
decompress-on-receive in Resource::assemble()).

Consumer-side changes:
- platformio.ini: pin microReticulum @2f21fee (pyxis-fixes-on-0.4.1) and
  microLXMF @33760d0 (chore/microreticulum-0.4.1-layout); bump microStore
  ceea8f5 -> c5fb69d (0.4.x requires the new BasicFileStore::init API);
  -std=gnu++11 -> gnu++17 (upstream requires C++17).
- Namespace all microReticulum includes (angle + quote) to <microReticulum/...>
  for the relocated layout; shim-local Utilities/Stream.h|Print.h preserved.
- Interface::send_outgoing now returns bool: update TCP/BLE/SX1262/Auto
  overrides with correct success/failure returns.
- SDArchiveFileSystem::init(bool reformatOnFail=true) to match new microStore.
- Static Transport::get_path_table() -> path_table(); instance getter unchanged.
- Remove duplicate shim Cryptography/BZ2 (microReticulum provides it now; keep
  lib/libbz2 as the ESP32 bzlib provider).
- patch_littlefs_paths.py: normalize microStore's LittleFS adapter paths to a
  leading "/" -- ESP32 Arduino LittleFS rejects "./"-prefixed paths, which
  silently broke the path store (no peer paths learned, all messaging blocked).

Validated on T-Deck Plus: builds (RAM 27.5% / Flash 77.7%), boots stable
(no WDT/panic), and a full on-device LXMF e2e (DIRECT + OPPORTUNISTIC +
bz2-compressed-Resource receive) passes 5/5.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UWZuYkHBRqNb6BZHV8sTG5

src/main.cpp

@@ -16,8 +16,8 @@
 #include <soc/rtc_cntl_reg.h>
 
 // Reticulum
-#include <Reticulum.h>
-#include <Utilities/OS.h>
+#include <microReticulum/Reticulum.h>
+#include <microReticulum/Utilities/OS.h>
 
 // Filesystem
 // Was: <UniversalFileSystem.h> (pyxis-provided RNS::FileSystem wrapper).
@@ -30,10 +30,10 @@
 // LittleFS reuses the same partition (label "spiffs") and reformats it
 // on first boot.
 #include <microStore/Adapters/LittleFSFileSystem.h>
-#include <Identity.h>
-#include <Destination.h>
-#include <Transport.h>
-#include <Interface.h>
+#include <microReticulum/Identity.h>
+#include <microReticulum/Destination.h>
+#include <microReticulum/Transport.h>
+#include <microReticulum/Interface.h>
 
 // TCP Client Interface
 #include "TCPClientInterface.h"
@@ -76,7 +76,7 @@
 #include "Tone.h"
 
 // Logging
-#include <Log.h>
+#include <microReticulum/Log.h>
 
 // SD Card access and logging
 #include <Hardware/TDeck/SDAccess.h>
@@ -1742,7 +1742,7 @@ static void handle_test_hook_command(const String& line) {
         Serial.println("T:OK announced");
     }
     else if (cmd == "T:PATHS") {
-        const auto& path_table = RNS::Transport::get_path_table();
+        const auto& path_table = RNS::Transport::path_table();
         Serial.print("T:OK count=");
         Serial.println(String((unsigned)path_table.size()));
         for (const auto& kv : path_table) {
@@ -1757,7 +1757,7 @@ static void handle_test_hook_command(const String& line) {
         // Diagnostic: also dump whether the in-memory _path_table has it,
         // and the size of each store. They should match when the dual-
         // write fix is working.
-        const auto& mem_table = RNS::Transport::get_path_table();
+        const auto& mem_table = RNS::Transport::path_table();
         bool mem_has = (mem_table.find(dest) != mem_table.end());
         Serial.print("T:OK ");
         Serial.print(has ? "1" : "0");