deps: update grpc to 1.84.0

[santigimeno]

No description provided.

[ns-control-tower]

Walkthrough

This PR re-snapshots the vendored gRPC under deps/grpc/ to upstream gRPC 1.84.0 (codename gimbal), on top of the base branch's protobuf 36.2 update. All 1486 changed files live under deps/grpc/; no N|Solid-side integration code changed (agents/grpc/ is untouched). The diff is essentially a vendored snapshot swap plus the build-list maintenance that goes with it.

Key points:

• Version markers are consistent and grounded. deps/grpc/Makefile:371 sets CPP_VERSION = 1.84.0; deps/grpc/src/core/lib/surface/version.cc:25 reports core 56.0.0 and :27 the codename gimbal, which matches the official upstream gRPC 1.84.0 ("gimbal") release — confirming the snapshot is a real upstream tag, not an ad-hoc tree.
• deps/grpc/grpc.gyp (the hand-maintained N|Solid build list) tracks upstream file moves. It adds new sources (ext_proc and composite filters, telemetry, xDS TLS, the consolidated DNS resolver) and drops files upstream removed (c-ares DNS resolvers, resolve_address*, blackboard, decode_fast.c).
• A new submodule is declared but not inlined. third_party/grpc-proto is added to deps/grpc/.gitmodules:56, but (like most gRPC submodules here — abseil, boringssl, protobuf, etc.) it is not vendored on disk. This is consistent with the existing vendoring pattern and is not needed at build time because the upb message code is pre-generated and checked into src/core/ext/upb-gen.

Assessment

Validated against a fresh clone of the PR head (aef3c1f) vs. the merge base (d33e23f, santi/update_protobuf):

• Build-list internal consistency (verified). Every one of the 1096 source files referenced in deps/grpc/grpc.gyp exists on disk at the PR head (0 missing). Conversely, every file the gyp removed is actually gone from the tree — so no orphaned references and no dropped-but-still-needed units. The one "removed then re-added" entry (envoy/config/core/v3/cel.upbdefs.c) is a reorder, not a real removal.
• New sources compile-ready (verified). Spot-checked all 31 newly-added .cc/.c entries in grpc.gyp — all present (e.g. src/core/transport/message_size_service_config.cc, src/core/filter/ext_proc/ext_proc_filter.cc, src/core/xds/grpc/xds_tls_context.cc).
• Supply chain. gRPC 1.84.0 is a published upstream release; the vendored version string matches. No new build-time network fetches or install scripts were introduced by the nsolid-side changes. The new grpc-proto submodule URL is the official grpc/grpc-proto.git.
• CI. Combined commit status on the head is pending (no statuses reported yet) — I could not validate the build via CI. Build correctness ultimately depends on the full nsolid compile and on gRPC 1.84.0 ↔ protobuf 36.2 compatibility; the author is driving both bumps in sequence (this PR's base is the protobuf-update branch), so they appear coordinated.

No blocking correctness, security, or performance findings. The change is a routine vendored dependency bump with a consistently maintained build list.

Verdict: APPROVE — clean vendored gRPC re-snapshot; build list verified internally consistent. Advisory only — does not replace required human review, and CI has not yet run.