feat(fetch_grpc): add empty fetch_grpc crate scaffold

[martintmk]

Adds a new placeholder crate fetch_grpc that will adapt a fetch HTTP client into a transport for the grpc crate, mirroring the structure of the existing fetch_azure adapter.

The crate is an empty scaffold for now (crate-level docs only, no dependencies); a real implementation will follow in a subsequent PR. It is registered in the workspace and the root README/CHANGELOG crate lists.

[github-actions]

⚠️ Breaking Changes Detected

error: failed to retrieve local crate data from git revision

Caused by:
    0: failed to retrieve manifest file from git revision source
    1: possibly due to errors: [
         failed when reading /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-origin_main/9a588f2deda6512c7151858a7203fa68074cfc1e/scripts/crate-template/Cargo.toml: TOML parse error at line 9, column 26
         |
       9 | keywords = ["oxidizer", {{CRATE_KEYWORDS}}]
         |                          ^
       missing key for inline table element, expected key
       : TOML parse error at line 9, column 26
         |
       9 | keywords = ["oxidizer", {{CRATE_KEYWORDS}}]
         |                          ^
       missing key for inline table element, expected key
       ,
         failed to parse /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-origin_main/9a588f2deda6512c7151858a7203fa68074cfc1e/Cargo.toml: no `package` table,
       ]
    2: package `fetch_grpc` not found in /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-origin_main/9a588f2deda6512c7151858a7203fa68074cfc1e

Stack backtrace:
   0: anyhow::error::<impl anyhow::Error>::msg
   1: cargo_semver_checks::rustdoc_gen::RustdocFromProjectRoot::get_crate_source
   2: cargo_semver_checks::rustdoc_gen::StatefulRustdocGenerator<cargo_semver_checks::rustdoc_gen::CoupledState>::prepare_generator
   3: cargo_semver_checks::Check::check_release::{{closure}}
   4: cargo_semver_checks::Check::check_release
   5: cargo_semver_checks::exit_on_error
   6: cargo_semver_checks::main
   7: std::sys::backtrace::__rust_begin_short_backtrace
   8: main

If the breaking changes are intentional then everything is fine - this message is merely informative.

Remember to apply a version number bump with the correct severity when publishing a version with breaking changes (1.x.x -> 2.x.x or 0.1.x -> 0.2.x).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (ece85ff) to head (ec0b146).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #561   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         356      356           
  Lines       27378    27378           
=======================================
  Hits        27378    27378           

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[Copilot]

Pull request overview

Adds a new workspace crate, fetch_grpc, as a placeholder scaffold for a future adapter that will let the fetch HTTP client back a transport for the grpc crate (mirroring the existing fetch_azure adapter pattern).

Changes:

• Introduces a new crates/fetch_grpc crate with initial package metadata and crate-level documentation.
• Registers fetch_grpc in the workspace dependency list and updates root README/CHANGELOG crate indexes.
• Adds crate branding assets (logo + favicon) and updates the spellchecker dictionary for “grpc”.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Adds fetch_grpc to the top-level crate list.
crates/fetch_grpc/src/lib.rs	Adds crate-level docs and rustdoc logo/favicon metadata.
crates/fetch_grpc/README.md	Adds the crate README scaffold content.
crates/fetch_grpc/logo.png	Adds crate logo asset (Git LFS pointer).
crates/fetch_grpc/favicon.ico	Adds crate favicon asset (Git LFS pointer).
crates/fetch_grpc/CHANGELOG.md	Adds initial changelog file scaffold.
crates/fetch_grpc/Cargo.toml	Adds new crate manifest with workspace-inherited settings and metadata.
CHANGELOG.md	Adds fetch_grpc to the root changelog index list.
Cargo.toml	Adds fetch_grpc to [workspace.dependencies].
Cargo.lock	Adds lockfile entry for the new workspace crate.
.spelling	Adds “grpc” to the spellchecker word list.

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