Add TurtleTerm agent reliability status CLI

[mdheller]

Summary

Adds a read-only TurtleTerm local operator surface for SourceOS Agent Reliability evidence.

What changed

• Added assets/sourceos/bin/turtle-agent-status
  • scans local .sourceos evidence artifacts
  • summarizes guardrail decisions, stop-gate artifacts, guarded invocation artifacts, and SocioSphere governance queues
  • reports status as ready, blocked, needs_review, or no_artifacts
  • supports human-readable and JSON output
  • is read-only: no policy, memory, git, queue, or agent mutation
• Added smoke tests to assets/sourceos/tests/test_sourceos_term_smoke.py
  • no-artifacts state
  • blocked guardrail decision
  • pending governance review queue
  • ready state from passing stop-gate/invocation artifacts
• Wired turtle-agent-status into make turtle-smoke Python compilation
• Added turtle-agent-status to Homebrew installed scripts and formula tests
• Updated README command and product-surface docs

Validation

Expected validation:

make turtle-smoke

Linked work

Refs #2
Refs SourceOS Agent Reliability Control Plane workstream.

[mdheller]

Capture update: superseded by #18.

#18 replayed the relevant agent reliability status CLI content onto current main and merged as dade8de3fb242db6bcca2b05b59ef118ea1fd4ad.

Captured:

• turtle-agent-status read-only status CLI.
• smoke coverage for no-artifacts, blocked, needs-review, and ready states.
• make turtle-smoke Python compilation wiring.
• Homebrew formula install/test updates needed for the status CLI.
• formula hardening needed for the full Homebrew matrix.

Validation observed on #18 head b9f1f35dc065f0ca6394b899a81bd9025e82ce29:

• Trust Surface: success
• TurtleTerm Linux Packaging: success
• TurtleTerm Script Checks: success
• TurtleTerm Homebrew Validation: success
• verify-pages: success
• TurtleTerm Security Checks: success

Content status: captured. This PR can be closed as superseded.