Mutation-scope hook ingress - #261

Define a harness-neutral CLI ingress for normalized mutation-scope lifecycle events,
including strict parsing, runtime wiring, failure semantics, and lazy database access.
Track parser and routing work, runtime integration, real Git/DB regressions, and durable context synchronization.
Plan: mutation-scope-hook-ingress (T01-T05)

Co-authored-by: SCE <[email protected]>

Validate JSON STDIN payloads for start, advance, close, flush, and abandon
operations while preserving boundary identifiers and mapping actor kinds to the
runtime enum. Reject unknown fields, worktree identity, invalid types, and blank
identifiers before routing is added.

Plan: mutation-scope-hook-ingress.md (T01)

Co-authored-by: SCE <[email protected]>

Expose the hidden `sce hooks mutation-scope` command as a strict, harness-neutral
JSON lifecycle ingress. Dispatch start/advance/close/flush boundaries and scope
abandonment through the protected runtime with lazy DB acquisition, preserving
durable-completion handling and empty stdout on success. Add parser, dispatch, and
runtime classification coverage.

Plan: mutation-scope-hook-ingress.md (T02)

Co-authored-by: SCE <[email protected]>

Exercise the production mutation-scope ingress against real temporary Git worktrees and state-root trace databases so lifecycle, replay, identity-conflict, abandonment, unscoped flush, and marker-clear durability behavior remain covered. Add a test-only database-resolver seam while preserving the production resolver path.

Plan: mutation-scope-hook-ingress, T03

Co-authored-by: SCE <[email protected]>

Record the hidden `sce hooks mutation-scope` transport as the harness-neutral
runtime ingress. The contract covers strict lifecycle payload parsing, identity
ownership and worktree derivation, lazy database acquisition, durable-completion
error classification, and the boundary between generic transport and concrete
harness adapters. Update the related runtime, routing, architecture, overview,
context-map, and plan records to describe the shipped behavior.

Plan: mutation-scope-hook-ingress (T04)

Co-authored-by: SCE <[email protected]>