chore(hashes): drop out-of-scope crates inside hashes crate

[ZocoLini]

Do this crates have a purpose?? They are not being used, tested in CI or in the workspace

Summary by CodeRabbit

• Tests

  • Removed comprehensive fuzzing targets and infrastructure for testing hash implementations.
  • Removed JSON and CBOR serialization schema validation tests.

• Chores

  • Removed embedded microcontroller crate and examples.
  • Removed fuzzing orchestration and continuous integration scripts.

[coderabbitai]

📝 Walkthrough

Walkthrough

Complete removal of embedded ARM example, schema validation test suite, and Honggfuzz fuzzing framework from the hashes crate. This eliminates approximately 714 lines across 14 files including Cortex-M binaries, test harnesses, fuzz targets, and build orchestration scripts.

Changes

Cohort / File(s)	Summary
Embedded ARM Example hashes/embedded/Cargo.toml, hashes/embedded/memory.x, hashes/embedded/src/main.rs	Removed Cortex-M no_std embedded binary example with heap allocator configuration, linker memory layout, and hash computation tests.
Schema Validation Tests hashes/extended_tests/schemars/Cargo.toml, hashes/extended_tests/schemars/src/main.rs	Removed Schemars-based JSON schema validation test suite covering multiple hash types (SHA-256, HMAC-SHA512, RIPEMD160, SHA1, SHA512, SipHash24, etc.).
Fuzzing Infrastructure hashes/fuzz/Cargo.toml, hashes/fuzz/fuzz_targets/sha1.rs, hashes/fuzz/fuzz_targets/sha256.rs, hashes/fuzz/fuzz_targets/sha512.rs, hashes/fuzz/fuzz_targets/sha512_256.rs, hashes/fuzz/fuzz_targets/ripemd160.rs, hashes/fuzz/fuzz_targets/cbor.rs, hashes/fuzz/fuzz_targets/json.rs, hashes/fuzz/travis-fuzz.sh	Removed entire Honggfuzz-based fuzzing framework including manifest, seven hash algorithm fuzz targets with round-trip serialization/deserialization tests, and Travis CI fuzzing orchestration script.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Farewell to fuzz and tests so grand,
Embedded code leaves the land,
Schemas fade and harnesses part,
Streamlined crate, a cleaner heart!
No more fuzzing, the path is clear—
A lighter repo, we celebrate here!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately describes the main change: removing out-of-scope crates (embedded, extended_tests/schemars, and fuzz directories) from the hashes crate.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/what-is-this

📝 Coding Plan

• Generate coding plan for human review comments

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.07%. Comparing base (b946271) to head (f862277).

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #535      +/-   ##
=============================================
+ Coverage      66.89%   67.07%   +0.17%     
=============================================
  Files            313      313              
  Lines          64753    64753              
=============================================
+ Hits           43317    43432     +115     
+ Misses         21436    21321     -115     

Flag	Coverage Δ		*Carryforward flag
core	75.02% <ø> (ø)
dash-network	75.00% <ø> (ø)		Carriedforward from b946271
dash-network-ffi	34.76% <ø> (ø)		Carriedforward from b946271
dash-spv	68.26% <ø> (ø)		Carriedforward from b946271
dash-spv-ffi	34.76% <ø> (ø)		Carriedforward from b946271
dashcore	75.00% <ø> (ø)		Carriedforward from b946271
dashcore-private	75.00% <ø> (ø)		Carriedforward from b946271
dashcore-rpc	19.92% <ø> (ø)		Carriedforward from b946271
dashcore-rpc-json	19.92% <ø> (ø)		Carriedforward from b946271
dashcore_hashes	75.00% <ø> (ø)		Carriedforward from b946271
ffi	37.76% <ø> (+1.16%)	⬆️
key-wallet	65.64% <ø> (ø)		Carriedforward from b946271
key-wallet-ffi	34.76% <ø> (ø)		Carriedforward from b946271
key-wallet-manager	65.64% <ø> (ø)		Carriedforward from b946271
rpc	19.92% <ø> (ø)
spv	81.06% <ø> (-0.03%)	⬇️
wallet	65.67% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.
see 19 files with indirect coverage changes

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