Add local SourceOS Agent Reliability session monitor and policy explainer

[mdheller]

Context

The SourceOS Agent Reliability Control Plane needs a local-first developer surface. TurtleTerm should make agent work visible and governable from the terminal, not force users into a hosted dashboard.

Related lane:

• SocioProphet/guardrail-fabric: SourceOS Agent Reliability Control Plane spec
• SocioProphet/socioprophet-agent-standards: SourceOS Agent Reliability Standard
• SocioProphet/agentplane: guarded workcells, stop gates, runtime evidence

Scope

Add TurtleTerm surfaces for:

• active agent sessions
• guardrail decisions
• blocked commands and remediation
• redaction events
• stop-gate status
• changed files/commits/PR/CI state
• human approval prompts
• audit bundle export
• Neovim handoff/navigation

UX requirements

• Terminal-native first; no mandatory hosted service.
• Show why blocked with policy ID, scope, reason, and remediation.
• Show what remains before done using AgentPlane stop-gate evidence.
• Allow local review of external-action drafts before PR/publish handoff.
• Provide a read-only session timeline that can be exported.
• Integrate with Neovim so files, diffs, and policy evidence are navigable.

Acceptance criteria

• TurtleTerm can read local .sourceos/logs/guardrail-decisions.jsonl and AgentPlane evidence artifacts.
• A blocked action is rendered with an actionable recovery path.
• Stop-gate failures are visible before an agent claims completion.
• No cloud telemetry is required for local operation.

Non-goals

• Do not make TurtleTerm the source of truth. It is the local operator surface over evidence generated by guardrail-fabric and AgentPlane.
• Do not introduce upstream/product-surface references that dilute TurtleTerm branding.