test: colocate delegate input tests

[zatevakhin]

Scope

• Includes d018bbd8bda34dfab6904be723bd59fc0c3e4020 (test: colocate delegate input tests) and follow-up contract fix 5d8c9b73593309e982dfd17e63b571df88bf0e87 (test: preserve delegate navigation contracts).
• Changes only test code in src/features/delegates/input/view.rs and src/runtime/mod.rs (+219/-88). Production prefixes are byte-identical to the base.
• Moves pure Delegate input ownership coverage to the owner module while retaining root routing, effect-ordering, popup-lifecycle, fallback-parent, and sibling-parent coordination coverage.

Contracts

• Owner tests preserve exact PendingChild handling for missing child sessions and exact LoadChild handling for ordinary and PendingElicitation children, including parent staging.
• Root tests preserve full handle_session_popup_key routing, ordered LoadSession then SubscribeSession effects, popup closure, current-session fallback when catalog parent metadata is absent, and explicit sibling-parent precedence.
• No production behavior, API, visibility, import, manifest, dependency, or protected path changes are included.

Validation

• Focused Delegate owner and root runtime suites passed.
• Debug and release full suites passed twice each: 1,173 tests per run.
• All-targets, cargo fmt --all -- --check, cargo check, cargo clippy, and cargo build passed.
• Aggregate diff, exact scope, protected paths, and production-prefix byte identity were verified.

Linus independently approved the corrected aggregate range 568c2f4f411fa4b581fc0803e58d7be84342794e..5d8c9b73593309e982dfd17e63b571df88bf0e87 with no findings and explicitly deemed it safe to publish and squash-integrate after hosted CI. Live ACP/backend and interactive terminal smoke were unavailable and are not claimed. Delegate renderer ownership and Phase 11 work are excluded.

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[zatevakhin]

Hosted CI passed and the guarded squash operation created integration commit 22737e2ac04d68f5eba334a0e94e52b60862549d on refactor/components. GitHub returned GraphQL error E76C:3C09FF:D0D0998:CAF9FD2:6A93AD15 after updating the base ref but left the PR open, so this closes the already-integrated PR without rerunning the merge or deleting the retained source branch.