Classify edge-probe/prohibition-probe predicate-generation as core
verification substrate (not an off-by-default Feature Capability),
settled before ADR-857 phase 6 (Migrate) freezes the core/plug-in line.
Prompted by @davesienkowski's boundary analysis on #857.
- ADR-857: amendment note + top-level decision carve-out + Loop Extension
Points exemption + new "Verification substrate vs. plug-in tier"
subsection + 2 Alternatives rows + phase-6 rollout exception + Open
Questions resolution.
- ADR-550: cross-reference pinning the core-substrate classification;
ties "exogenous grading" to Decision 4 (judgment-tier) and Decision 5
(test the contract, not the classifier).
- CONTEXT.md: glossary — Probe Core / Edge Probe reclassified (probe-core
on the contract side, adapters as the generator) + new "Verification
substrate (predicate boundary)" term.
Decomposition: the verifier<->predicate contract is core/non-toggleable;
the generator (probe adapters) is core-default but independently
versionable. Docs-only; no user-facing change.
Closes#1120
Refs #857
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Record the final-state architecture: the five-step loop (Discuss → Plan →
Execute → Verify → Ship) plus shared-infrastructure skills are the privileged
host/core; every other feature is a Capability (plug-in) selectable at install
and toggleable after restart, attaching through ~12 Loop Extension Points.
Adds docs/adr/857-capability-system.md (Status: Proposed) capturing the eight
resolved design decisions, the resolved design details (extension points,
contribution merge, declaration shape, runtime descriptor, deferred trust gate),
alternatives, consequences, and a six-phase rollout. Records the new domain
terms in CONTEXT.md: Capability, Capability Registry, Loop Extension Point,
Runtime Capability.
Runtime/CLI support is itself a Capability (role: runtime) — Claude Code, Codex,
Antigravity tier-1; the seam is declarative-over-primitives so third-party CLI
support lands later as an additive loader, no rework.
Closes#857
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
