v0.0.4

EchoSVM v0.0.4

EchoSVM now connects source-aware causal evidence to the exact sBPF
instructions leading into a real local transaction failure.

Included

• Provenance and confidence on causal claims: runtime-observed,
  runtime-derived, fixture-declared, or heuristic.
• Correct parent-frame attribution when privilege checks reject a CPI before
  callee entry.
• --trace-on-failure and --trace-limit for bounded, in-memory LiteSVM
  register traces attached to transaction frames.
• Exact tail instructions for the bundled PDA mismatch, ending at
  syscall sol_invoke_signed_rust.
• Structured standalone halt kinds for instruction budget, access violation,
  divide-by-zero, call depth, and unsupported instructions.
• Seven focused conformance vectors covering v3 ALU64, JMP32, memory faults,
  verifier failures, version gates, and deterministic traces.
• Backward-compatible optional additions to the v1 case, evidence, and
  execution schemas.

Honest boundary

PDA seeds and tentative failed-state values remain declared fixture
expectations and are now labeled as such. EchoSVM does not claim validator
equivalence, complete sBPF compatibility, or historical Mainnet replay. V4 is
still experimental; the new compatibility claims are bounded to the published
vectors.