ExecSurface v0.1.0-alpha.3

Third public alpha, promoting the ptrace lifecycle hardening and the M9.1 external-workload evidence already merged to main.

Reliability and validation

incorporates the lifecycle-specific ptrace hardening closed under issue #55;
retains fail-closed completeness and existing PASS / REVIEW / BLOCK / ERROR authority semantics;
adds durable lifecycle regression coverage, including the pinned casey/just external workload;
carries M9.1 zero-contact external workload evidence for just, ripgrep, fzf, and fd;
preserves negative and PARTIAL evidence for unstable build/test surfaces rather than relabeling it as success.

Linux x86_64 remains the public support scope;
native ptrace remains the public correctness-reference backend;
GitHub Release binary, crates.io package chain, and the stable AETHERXGLOBAL/execsurface@v0.1 Action channel remain the intended distribution surfaces;
this release does not authorize the experimental eBPF backend for PASS, learn/check, automatic backend selection, or baseline interchangeability.

ExecSurface detects observed runtime execution-surface drift. It does not prove software safety, and observed behavior is not all possible behavior.

Source commit: 79c4542730a1a4698db859d9f399cb39bf41ead3