Approve.

Delta reviewed:
- Re-reviewed the fix commit `b30b43b9 test: cfg-gate e2e observer payloads` after the earlier request-changes review.
- Inspected the updated observer module boundary and call sites in `crates/tui/src/lib.rs` and `crates/tui/src/multi_pod.rs`, plus the unchanged harness/tests in `tests/e2e`.

Evidence:
- `e2e_observer` is now only compiled from `crates/tui/src/lib.rs` under `#[cfg(feature = "e2e-test")]`; the previous normal-build no-op facade was removed.
- Observer payload construction is gated at call sites with `#[cfg(feature = "e2e-test")]`, including `panel_ready`, `selection_changed`, `action_requested`, `quit_requested`, and `emit_rows_rendered` calls.
- Panel E2E DTOs/helpers (`PanelE2eRowKey`, `PanelE2eRect`, `PanelE2eRenderedRow`, `PanelE2eRowsRendered`, `App::emit_rows_rendered`) are now behind `#[cfg(feature = "e2e-test")]`, so the normal panel render path no longer builds row snapshots or retains that runtime helper path.
- The background-task hold seam is still feature-gated: `check_background_task_hold` and `release_background_task_hold` calls are under `#[cfg(feature = "e2e-test")]`, and `YOI_TUI_TEST_HOLD_BACKGROUND_TASK` behavior lives in the gated observer module.
- Mouse capture tracking remains intact in the harness: it tracks `?1000h` and `?1006h`, `click(...)` requires both capture modes before injecting PTY bytes, the test waits for rendered rows, asserts `selection_changed`, and asserts no `action_requested` dispatch.
- Quit-latency coverage remains intact: the test waits for `panel_ready`, then verifies an actual pending `reload` background-task barrier before sending Ctrl+C through the PTY and asserting bounded exit.
- The production/non-production boundary now satisfies the Ticket intent: the harness remains opt-in, observability is read-only and feature-gated, and no UI input/action path is bypassed.

Validation run in `/home/hare/Projects/yoi/.worktree/e2e-harness`:
- `git diff --check 134e8b8b..HEAD` — passed.
- `cargo fmt --check` — passed.
- `cargo check -p tui --all-targets` — passed.
- `cargo check -p yoi --all-targets` — passed.
- `cargo check -p tui --all-targets --features e2e-test` — passed.
- `cargo check -p yoi --all-targets --features e2e-test` — passed.
- `cargo build -p yoi --features e2e-test` — passed.
- `YOI_E2E_BIN=/home/hare/Projects/yoi/.worktree/e2e-harness/target/debug/yoi cargo test -p yoi-e2e --features e2e --test panel -- --nocapture` — passed; 2 tests passed.
- `cargo check -p yoi-e2e --all-targets --features e2e` — passed.

No source changes were made during re-review.
