deps: update to protobuf 36.2

[santigimeno]

No description provided.

[ns-control-tower]

Walkthrough

This PR bumps the vendored protobuf library under deps/protobuf/ from C++ 7.34.0 → 7.36.2 (protoc 34.0 → 36.2). It is a three-part change:

1. Vendored library source (deps/protobuf/src/, 340 modified + 38 added) — the upstream protobuf 36.2 code, including new EDITION_2026 support in descriptor.proto, first-class custom-option extension ranges (990–998), the arena-pointer simplification that drops the PROTOBUF_INTERNAL_REMOVE_ARENA_PTRS_* macros, and removal of the minimum-compiler/abseil static_asserts in port_def.inc (an upstream decision; N|Solid's toolchain already exceeds those floors).
2. Build integration (deps/protobuf/protobuf.gyp, version.json) — the gyp source list gains the 9 new runtime/cpp-compiler .cc files and drops compiler/cpp/main.cc (renamed upstream to plugin_main.cc). version.json moves to 36.x / 7.36.2.
3. Regenerated checked-in bindings — 26 files under agents/grpc/src/proto/*.pb.{cc,h} and 20 under deps/opentelemetry-cpp/.../gen/cpp/*.pb.{cc,h}, all regenerated by protoc 36.2. The .proto schemas (N|Solid agents use proto3; OTLP schemas are unchanged) and the gRPC-plugin output (.grpc.pb.cc) are deliberately left untouched.

The hand-written C++ in agents/grpc is unchanged; it recompiles against the 7.36.2 headers.

Assessment

I verified the build-integration completeness against the PR tree rather than reading the 381-file diff line by line, since ~98% of the diff is auto-generated (DO NOT EDIT) .pb.* files and vendored upstream source.

• gyp source list is complete and correct (deps/protobuf/protobuf.gyp): all 120 .cc sources the gyp lists exist in the pr-568 tree; the 9 newly-added files (arena_allocation_policy.cc, cpp_file_options.pb.cc, json_enumvalue_options.pb.cc, naming_style.cc, symbol.cc, type_id.cc, unknown_field_set_lite.cc, compiler/cpp/field_layout.cc, compiler/cpp/plugin_main.cc) are all present, and the removed compiler/cpp/main.cc is correctly gone. Language-plugin sources (csharp/java/kotlin/objectivec/php/python/ruby/rust) and test/benchmark files remain correctly excluded — consistent with how the gyp was structured before the bump.
• No .proto schema changes for N|Solid consumers: the agents gRPC .proto files (all syntax = "proto3") and the OpenTelemetry .proto files are unchanged — only generated code was regenerated, so the new EDITION_2026 / first-class-option features in descriptor.proto do not affect N|Solid's bindings.
• .grpc.pb.cc files unchanged: only the protoc-generated .pb.* were regenerated; the gRPC-plugin output was left as-is, which is correct for a protoc-only bump.
• No new runtime .cc missing from the gyp: I checked the reverse direction (.cc files present in the tree but absent from the gyp) and found only pre-existing optional/test/benchmark files and language-plugin sources — nothing newly required by this bump was left out.
• CI: the combined commit status is pending with 0 statuses, so there is no CI evidence that the build actually compiles yet. The static analysis above is the validation.

No blocking correctness, security, or performance findings. This is a routine vendored-dependency bump with a correctly maintained build integration.

Verdict: APPROVE — clean protobuf 7.34.0 → 7.36.2 bump; the protobuf.gyp source list is complete, generated code is consistently regenerated, and the .proto schemas are unchanged. Build compilation has no CI confirmation yet, so a green build run is worth confirming before merge.