feat(backlog): flesh the defer mechanics, pre-flight Q&A, and page

The defer checklist gained its filing mechanics. A deferral VERIFY now dedups against an existing sibling before filing, since the deferred task stays TODO and every later run would otherwise re-file. Placement, heading, and body follow the todo conventions.

A quick-question gap routes to the pre-flight Q&A only under the speedrun preset, and only for one-line factual or preference picks. Three or more questions means the task is underspecified and files instead. The data-loss item never routes to the Q&A.

The batch-ask is one message with recommendation-first numbered options, and answers land as dated lines in the task bodies before the run starts. The page fires exactly once, on set-done or cap-hit, via notify --persist.

1 files changed, 2 insertions, 2 deletions

diff --git a/todo.org b/todo.org
index 0732319..eadd5d9 100644
--- a/todo.org
+++ b/todo.org
@@ -468,8 +468,8 @@ inbox.org auto-mode item 3 regained its "run this batch next?" ask, now chaining
 *** 2026-07-02 Thu @ 01:18:07 -0400 Phase 3 landed — waiver-gated commit autonomy
 Pinned the waiver format per D5: two marker lines in .ai/notes.org Workflow State — :COMMIT_AUTONOMY: yes (has the waiver) and :LOOP_MAY_COMMIT: yes (the unattended loop may also commit; requires the first). Absent or non-yes reads as no; the read is a fresh grep each run, never memory. Degrade contract written into work-the-backlog.org (surface in run intro + summary, never honor without the marker, never degrade silently); caller sections + Common Mistakes updated. Stamped rulesets' own :COMMIT_AUTONOMY: yes; :LOOP_MAY_COMMIT: deliberately not granted — Craig's call. .emacs.d holds the waiver too but its notes.org is its own scope; told via inbox-send to stamp its marker.
 
-*** TODO [#C] Phase 4 — defer checklist, pre-flight Q&A, end-of-set page :feature:solo:
-Implement the act-vs-file defer checklist (test-writability keystone, enumerated data-loss list, already-satisfied, design-deliberation), the speedrun pre-flight decision-gathering (gather → classify → order → intro → batch-ask → skip/answer), VERIFY-on-ambiguity filing, and the end-of-set notify alarm --persist page. Spec Phase 4 / D3 / D6 / D8. Verify: checklist only reduces what runs; pre-flight fires only under the speedrun preset.
+*** 2026-07-02 Thu @ 01:21:47 -0400 Phase 4 landed — checklist mechanics, pre-flight Q&A contract, page
+The four-item checklist (in since Phase 1) gained its mechanics: a VERIFY-filing subsection (dedup against an existing sibling first — the deferred task stays TODO, so without the check every run re-files; placement/heading/body per todo-format.md) and a quick-question routing subsection (discriminator: one-line factual/preference pick vs tradeoff-weighing; three-plus questions = underspecified = file; item 2 data-loss never routes to Q&A). Preset section gained the batch-ask contract (one message, recommendation-first numbered options per interaction.md, answers recorded as dated lines in the task bodies before the run). Page section finalized (fires once on set-done or cap-hit; notify --persist is the paging surface). Common Mistakes 12-13 added. Checklist only ever reduces what runs; pre-flight fires only under the preset.
 
 *** TODO [#C] Phase 5 — per-task JSONL metrics log :feature:solo:
 Append the per-task record to .ai/metrics/work-the-backlog.jsonl at each task outcome. Spec Phase 5. Verify: logging never alters execution.