feat: add local test-utils crates (arbitrary, btc, btcio)

[prajwolrg]

Description

• Introduces three new workspace-local test utility crates under crates/test-utils/:

  • strata--test-utils-arb — generic Arbitrary generator backed by OsRng
  • strata--test-utils-btc — BtcMainnetSegment fixture loader providing real mainnet blocks (around difficulty-adjustment boundary 40_320) and 1_ 000 contiguous headers (heights 40_000–50_000) for header-chain verification tests.
  • strata-test-utils-btcio — regtest Bitcoin transaction utilities (funding, signing, MuSig2 multi-sig, broadcasting)

• Removes three external strata-test-utils* git dependencies (strata-test-utils, strata-test-utils-btc, strata-test-utils-btcio) from the alpen, replacing all usages with the new local crates.

• Refactors all downstream consumers (btc-verification, common, proof/statements, worker, all subprotocol crates, all txs crates, and integration tests) to import from the new strata-asm-test-utils-* crates.

• Improves header_verification tests to use BtcMainnetSegment directly, avoiding the cyclic dev dependency.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor
• New or updated tests
• Dependency update
• Security fix

Notes to Reviewers

Checklist

• I have performed a self-review of my code.
• I have commented my code where necessary.
• I have updated the documentation if needed.
• My changes do not introduce new warnings.
• I have added tests that prove my changes are effective or that my feature works.
• New and existing tests pass with my changes.

Related Issues

[github-actions]

Commit: 9de13ed
SP1 Execution Results

program	cycles	success
ASM STF	533,229,453	yes

[codecov]

Codecov Report

❌ Patch coverage is 92.01954% with 49 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/test-utils/btcio/src/harness.rs	53.84%	30 Missing ⚠️
crates/test-utils/arb/src/lib.rs	86.36%	3 Missing ⚠️
crates/test-utils/btc/src/lib.rs	94.64%	3 Missing ⚠️
crates/test-utils/btcio/src/signing.rs	95.58%	3 Missing ⚠️
crates/test-utils/btcio/src/submit.rs	97.56%	3 Missing ⚠️
crates/test-utils/btcio/src/transaction.rs	91.89%	3 Missing ⚠️
crates/btc-verification/src/header_verification.rs	97.97%	2 Missing ⚠️
crates/test-utils/btcio/src/address.rs	95.45%	1 Missing ⚠️
crates/test-utils/btcio/src/utils.rs	83.33%	1 Missing ⚠️

Files with missing lines	Coverage Δ
crates/btc-verification/src/utils_btc.rs	100.00% <100.00%> (ø)
crates/common/src/aux/provider.rs	95.87% <ø> (ø)
crates/proof/statements/src/test_utils.rs	100.00% <100.00%> (ø)
crates/subprotocols/admin/src/handler.rs	94.71% <ø> (+5.79%)	⬆️
crates/subprotocols/admin/src/state.rs	99.43% <ø> (ø)
crates/subprotocols/bridge-v1/src/handler.rs	95.78% <ø> (ø)
...tes/subprotocols/bridge-v1/src/state/assignment.rs	95.17% <ø> (-0.22%)	⬇️
crates/subprotocols/bridge-v1/src/state/bitmap.rs	97.60% <ø> (ø)
crates/subprotocols/bridge-v1/src/state/bridge.rs	98.33% <ø> (ø)
crates/subprotocols/bridge-v1/src/state/deposit.rs	100.00% <ø> (ø)
... and 22 more

... and 1 file with indirect coverage changes

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