docs: add implementation plan to align code with feedback loop ADR

Vertical-slice plan with five slices across four phases, each with
acceptance criteria, manual verification, and human-review checkpoints
between phases. Surfaces and orders the inconsistencies between the
current code and the per-task loop language. Flat todo.md mirrors the
plan as a checkable task list.

tasks/todo.md

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+# Todo — Per-Task Feedback Loop alignment
+
+Flat task list for execution. Detailed acceptance criteria, files, and verification steps live in [`plan.md`](./plan.md). Tick items as you complete them; pause at each **Checkpoint** for review before continuing.
+
+## Phase 1 — Foundation
+
+### Slice 1 — Initial Plan capture
+
+- [ ] Add `initialPlan: Stepable[] | null` to `Recordable` interface
+- [ ] Round-trip `initialPlan` in `TaskRecord.fromRecordable`
+- [ ] In `startStepRecord`, snapshot `task.steps` into `record.initialPlan` when `stepRecords` is empty and `initialPlan` is not yet set
+- [ ] Add fallback to `task.stepHistory[0]` when `record.initialPlan` is missing (legacy data)
+- [ ] Replace `step.value.estimation` with Initial Plan lookup in `StepRecord.vue` "off by 10%" computation
+- [ ] Update `RecordResume.vue` total comparison to sum Initial Plan estimations
+- [ ] Add unit tests: snapshot occurs on first Step Record; re-estimation does not mutate `initialPlan`; legacy fallback works
+- [ ] `pnpm test` green
+- [ ] Manual verification per `plan.md` Slice 1
+
+### Slice 2 — Preserve records on re-planning
+
+- [ ] Audit consumers of `record.stepRecords` for "step is in current Plan" assumptions
+- [ ] Replace `cleanCurrentStepId` with non-destructive reconciliation: never delete records, only set the new `currentStepId`
+- [ ] Replace destructive `syncTaskRecord` body with the same non-destructive reconciliation
+- [ ] Add unit tests for reorder, delete-completed, delete-in-progress, insert-at-start
+- [ ] `pnpm test` green
+- [ ] Manual verification per `plan.md` Slice 2
+
+### ✋ Checkpoint 1 — Foundation review
+
+- [ ] Full test suite green
+- [ ] Manual smoke: full Task lifecycle with re-estimation and re-planning
+- [ ] Reviewer (human) confirms Foundation matches `CONTEXT.md` semantics
+
+---
+
+## Phase 2 — Closing the loop
+
+### Slice 3 — Closing Ceremony view
+
+- [ ] Implement pure `computeFailureModes({ initialPlan, finalPlan, stepRecords })` service
+- [ ] Unit tests for all three modes in isolation and combined
+- [ ] Decide: orphan record handling (default: hidden, time still totalled)
+- [ ] Decide: auto-navigate to ceremony on Task completion (default: CTA-only)
+- [ ] Rename `TaskHistory.vue` → `TaskClosingCeremony.vue`; replace body
+- [ ] Update router: route name → `task-closing-ceremony`; path preserved
+- [ ] Add "Close the loop" CTA in `TaskRecord.vue` when `record.end` is set
+- [ ] Trim `RecordResume.vue` to a one-line tease
+- [ ] Bind ceremony Notes textarea to the same Pinia field as during-Execution Notes
+- [ ] Component smoke test on `TaskClosingCeremony`
+- [ ] `pnpm test` green
+- [ ] Manual verification: each of the three modes per `plan.md` Slice 3
+
+### ✋ Checkpoint 2 — Closing Ceremony review
+
+- [ ] Full test suite green
+- [ ] End-to-end loop demo: create → start → re-plan mid-flight → finish → open Ceremony → three modes correct
+- [ ] Reviewer (human) confirms Ceremony surface matches intent
+
+---
+
+## Phase 3 — UX split
+
+### Slice 4 — Re-estimation inline / Re-planning modal
+
+- [ ] Add `reEstimateStep({ taskId, stepId, newEstimationMinutes })` action to task store
+- [ ] Push a new `stepHistory` entry on re-estimation (Plan structure unchanged, only the number)
+- [ ] Confirm via unit test that `record.initialPlan` is unaffected by re-estimation
+- [ ] Extend inline-edit pattern in `StepRecord.vue` to cover the `estimation` cell on any Step
+- [ ] Inline editor commits on Enter, cancels on Esc
+- [ ] Rename modal heading to "Re-plan steps" (or similar); update explanatory text
+- [ ] Relabel the "+" button in `RecordControls.vue` to "Re-plan"
+- [ ] Component test for inline estimation editor
+- [ ] Decide where the Step-Back Signal renders (default: deferred, see Out-of-Scope in plan)
+- [ ] `pnpm test` green
+- [ ] Manual verification per `plan.md` Slice 4
+
+### ✋ Checkpoint 3 — UX review
+
+- [ ] Full test suite green
+- [ ] Re-estimation is one-click + Enter, no modal
+- [ ] Re-planning opens modal with deliberate framing
+- [ ] Reviewer (human) confirms UX matches intent
+
+---
+
+## Phase 4 — Cleanup
+
+### Slice 5 — Model and naming hygiene
+
+- [ ] Grep for `updateSteps`, remove method (identical to `newSteps`), update tests
+- [ ] Rename `newSteps` → `rePlan` on `Task`
+- [ ] Grep for `editSteps` (append semantics): remove if unused, keep otherwise
+- [ ] Drop `readonly` from the `stepHistory` constructor parameter on `Task`
+- [ ] Re-examine `wasUpdated`: rename to `hasSteps` or remove if unused
+- [ ] Rename `cleanCurrentStepId` → `reconcileWithReplannedPlan` (or similar)
+- [ ] Tighten `TaskRecord.start` type to `ISODate | null`; initialize as `null`
+- [ ] Update all consumers of `TaskRecord.start` to handle `null` (until first Step Record)
+- [ ] Update `CONTEXT.md`: define `Task Date` and `Task Link`
+- [ ] `pnpm test:types` after renames
+- [ ] `pnpm test` green
+- [ ] `pnpm build` succeeds
+
+### ✋ Checkpoint 4 — Final review
+
+- [ ] Full test suite green
+- [ ] `pnpm build` succeeds
+- [ ] Fresh-localStorage smoke (incognito) — no migration footgun
+- [ ] Plan considered complete
+
+---
+
+## Out of scope (parked)
+
+- `breakTime` single-pause model
+- Cross-Task pattern analytics
+- Step-Back Signal rendering (decided per-slice; default deferred)