refactor(daemon): establish the interaction application facade

[thymikee]

Parent: #2132

Blocked by: #2166 (merged). This interaction slice is file-disjoint from the lifecycle chain and may run in parallel with its first child, but only one full host gate at a time.

Outcome

Establish one interaction application facade and move the shared execution/finalization boundary out of handlers before moving leaf command implementations. This child must shrink broad SessionState/SessionStore authority; a directory-only move is insufficient.

Exact production scope

Move/refactor these shared modules under src/daemon/interaction/internal/:

• src/daemon/handlers/interaction-common.ts
• src/daemon/handlers/interaction-runtime.ts
• src/daemon/handlers/interaction-snapshot.ts
• src/daemon/handlers/interaction-flags.ts
• src/daemon/handlers/interaction-read.ts
• src/daemon/handlers/interaction-ref-policy.ts
• src/daemon/handlers/interaction-recorded-input.ts
• src/daemon/handlers/interaction-ambiguity-publication.ts

Add src/daemon/interaction/index.ts as the only external facade. Its initial exports are the named interaction route input plus the exact shared operations genuinely consumed by src/daemon/generic-settle.ts, src/daemon/selector-runtime.ts, and src/daemon/selector-runtime-backend.ts. Update those three consumers to the facade; none may deep-import internals.

Keep src/daemon/handlers/interaction.ts and leaf interaction-touch-* / interaction-gesture.ts route code in place for this child, consuming the facade. Do not move find yet.

Authority contract

Replace broad shared finalization inputs with named operations around existing owners: action recording, snapshot publication, ref-frame expiry, deferred-outcome marking, script-recording query, and gesture visualization. Foreign writes remain in session-snapshot.ts, ref-frame.ts, interaction-outcome-policy.ts, deferred-interaction-outcome.ts, and script-publication owners.

The retained read surface must be explicit and no broader than current behavior: device, surface, appBundleId, trace, snapshot, snapshotGeneration, lease, and screenRecording where genuinely required. No anonymous Pick<SessionState>, copied record, or broad store capability.

Behavior and structural proof

Move the one-to-one shared tests, including interaction-common, flags, ref-policy, ambiguity publication, snapshot-scope/target-evidence, response-construction guard, and settle tests. Characterize action/result recording, parameterized fill, target evidence, deferred retry marking, snapshot replacement, settle flag errors, and selector-runtime read behavior before movement.

Plant: handler deep-import of interaction/internal, internal import of handlers, a non-owner write to each deferred outcome field, and a direct deep import from each of the three external consumers. Observe the named red failures before final green.

Shrink and validation

The deletion argument is removal of repeated broad context/store threading across touch, gesture, type, settle, and selector reads. Report gross and move-adjusted production LOC; stop if production grows after discounting moves. Run focused interaction/deferred tests, R7/session-state tests, layering/fallow checks, and pnpm check:affected --run after staging.

Preserve ADR 0011/0012/0014/0019 semantics, lazy route loading, typed errors, wire response construction, and recording behavior.