Inject options in nanopb .options files into the protobuf files used for code generation

[ianmcorvidae]

This will let us look at things like max lengths, ostensible int sizes, and things like that if we want to, or library consumers want to.

[Copilot]

Pull request overview

Adds tooling to inject nanopb .options constraints (e.g. max_size, int_size, max_count) directly into the temporary .proto files used by the Python protobuf code generator, so that the generated *_pb2.py descriptors carry those nanopb annotations and can be inspected at runtime via field.GetOptions().Extensions[nanopb_pb2.nanopb]. The bulk of the diff is regenerated *_pb2.py files reflecting the new embedded options.

Changes:

• New bin/inject_nanopb_options.py script that parses a nanopb .options file and rewrites field declarations in a .proto file to include inline (nanopb).* field options, adding a nanopb.proto import as needed.
• bin/regen-protobufs.sh now invokes the injector for every .options/.proto pair before running protoc.
• Regenerated _pb2.py descriptors across the protobuf package now contain serialized nanopb field options, along with the corresponding nanopb_pb2 imports and updated _serialized_start/_serialized_end offsets.

Reviewed changes

Copilot reviewed 1 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
bin/inject_nanopb_options.py	New script that injects nanopb .options into proto field declarations.
bin/regen-protobufs.sh	Calls the injector for each .options file before generating Python code.
meshtastic/protobuf/admin_pb2.py	Regenerated with embedded nanopb field options and updated offsets.
meshtastic/protobuf/apponly_pb2.py	Regenerated to embed nanopb settings option.
meshtastic/protobuf/atak_pb2.pyi	Regenerated stub; lost the epw trailing comment docstring.
meshtastic/protobuf/cannedmessages_pb2.py	Regenerated with messages max_size option.
meshtastic/protobuf/channel_pb2.py	Regenerated with PSK/name/index nanopb options.
meshtastic/protobuf/clientonly_pb2.py	Regenerated with DeviceProfile string size options.
meshtastic/protobuf/config_pb2.py	Regenerated with many size/int_size options across configs.
meshtastic/protobuf/connection_status_pb2.py	Regenerated with WiFi SSID size option.
meshtastic/protobuf/device_ui_pb2.py	Regenerated with UI int_size and string size options.
meshtastic/protobuf/deviceonly_pb2.py	Regenerated with UserLite/NodeInfoLite size options.
meshtastic/protobuf/interdevice_pb2.py	Regenerated with NMEA max size option.
meshtastic/protobuf/module_config_pb2.py	Regenerated with module config size/int_size options.
meshtastic/protobuf/mqtt_pb2.py	Regenerated with MapReport string size options.
meshtastic/protobuf/rtttl_pb2.py	Regenerated with ringtone max size.
meshtastic/protobuf/serial_hal_pb2.py	Regenerated with serial HAL data/error size options.
meshtastic/protobuf/storeforward_pb2.py	Regenerated with text max size option.
meshtastic/protobuf/telemetry_pb2.py	Regenerated with int_size/repeated count options.
meshtastic/protobuf/xmodem_pb2.py	Regenerated with seq/crc/buffer nanopb options.

Files not reviewed (19)

• meshtastic/protobuf/admin_pb2.py: Language not supported
• meshtastic/protobuf/apponly_pb2.py: Language not supported
• meshtastic/protobuf/atak_pb2.py: Language not supported
• meshtastic/protobuf/cannedmessages_pb2.py: Language not supported
• meshtastic/protobuf/channel_pb2.py: Language not supported
• meshtastic/protobuf/clientonly_pb2.py: Language not supported
• meshtastic/protobuf/config_pb2.py: Language not supported
• meshtastic/protobuf/connection_status_pb2.py: Language not supported
• meshtastic/protobuf/device_ui_pb2.py: Language not supported
• meshtastic/protobuf/deviceonly_pb2.py: Language not supported
• meshtastic/protobuf/interdevice_pb2.py: Language not supported
• meshtastic/protobuf/mesh_pb2.py: Language not supported
• meshtastic/protobuf/module_config_pb2.py: Language not supported
• meshtastic/protobuf/mqtt_pb2.py: Language not supported
• meshtastic/protobuf/rtttl_pb2.py: Language not supported
• meshtastic/protobuf/serial_hal_pb2.py: Language not supported
• meshtastic/protobuf/storeforward_pb2.py: Language not supported
• meshtastic/protobuf/telemetry_pb2.py: Language not supported
• meshtastic/protobuf/xmodem_pb2.py: Language not supported

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.57%. Comparing base (fddaad3) to head (a7d13eb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #922   +/-   ##
=======================================
  Coverage   61.57%   61.57%           
=======================================
  Files          25       25           
  Lines        4448     4448           
=======================================
  Hits         2739     2739           
  Misses       1709     1709           

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