docs: retire Phase Rho from the plan, record it as landed

docs/COMPLETED.md

@@ -887,3 +887,58 @@ wrong that refusal costs a working capture. Each track's DAW-verification obliga
 is recorded in `docs/PLAN.md`'s Phase Ψ section; `docs/verify-track-scope-multitrack.md`
 is a new standalone verification script on this branch, for Ψ-W3-T1's multi-track
 refusal specifically. No human has observed any of these seven behaviors in a DAW.
+
+### Phase Ρ — Render in place: a track's output to a new sibling, source to the bench
+
+One wave, one track (Ρ-W1-T1 `render-in-place`), code-complete, reviewed, remediated, and
+merged to `dev` as `b400384`: 91/91 tests passing, a clean build. Phase Ρ came from a
+direct request (Daniel, 2026-08-02) rather than a backing product doc list — see
+`docs/product/render-in-place.md` for the framing and its three [Daniel]-class forks
+(Ρ-F1/F2/F3), all ruled the day the phase was framed.
+
+**Ρ-W1-T1 — `render-in-place`.** One bindable action, `RENDER_TRACK_IN_PLACE`, renders
+the selected track's output over the current range to the project's recording path —
+never the bank — places it as an item on a brand-new sibling track at the exact unsnapped
+render position, clones the source's colour and its name with an idempotent `Capture `
+prefix, moves the source track to Design mode, and puts the result track into Arrange
+unconditionally (the Ρ-F2 ruling). New `src/shell/capture/render_in_place.{h,cpp}`.
+Extended `core/capture/track_topology` (`siblingPlacement`), `core/capture/capture_name`
+(`captureTrackName`), `core/capture/capture_paths` (`RenderPaths`/`deriveRenderPaths`,
+with `deriveBankPaths` re-expressed over it). A `CaptureDestination` enum was added to
+`CaptureRequest`; `render_bounds_gate` became destination-aware. A filter added to
+`panel_input::detectNewContent`, one `ActionTableRow` in `src/app/main.cpp`. All four
+invariant amendments the plan required (`src/shell/capture/CLAUDE.md`,
+`src/shell/actions/CLAUDE.md`, root `CLAUDE.md` §"The load-bearing principle",
+`src/core/view/CLAUDE.md`) landed inline with the track.
+
+**Four deviations worth recording:**
+
+1. **The `activeModeId` acceptance criterion was met in spirit, not to the letter.** The
+   criterion said `activeModeId()` must appear only in the `applyMode` reapply. The
+   implementer added the spec-recommended one-line Design-fired `ShowConsoleMsg`, which
+   requires reading the active mode, and hoisted that read into a single named local
+   shared by the message condition and the reapply. All three `tag()` calls still take
+   literal mode ids, so the ruling the criterion protects (Ρ-F2) holds. Review accepted
+   this explicitly.
+2. **The `panel_input` edit was larger than the spec's estimate** — the spec budgeted
+   "two lines only"; the landed change is six lines plus an `<algorithm>` include and
+   dropping a `const`, still confined to `detectNewContent`.
+3. **`TrackList_AdjustWindows(false)` was included preemptively** where the spec had
+   asked to `[verify — DAW]` whether it is needed. Consequence worth recording: the DAW
+   check can no longer distinguish, so answering that question now requires commenting
+   the call out locally.
+4. **A behavioural change beyond Ρ's stated scope**, surfaced in review and judged an
+   improvement: a track restored by undo now keeps its original mode instead of being
+   re-tagged to the active mode. Its reach is narrower than it sounds —
+   `ViewModeModel::reconcile` prunes records for GUIDs that have gone away, so a track
+   absent across a reconcile pass still falls back to the old behaviour.
+
+Both **[propose at review]** items resolved to the plan's own recommendations: the
+Design-fired console message was added (yes), and no master-track refusal was added
+(no — `ResolveScopeSource` already refuses a master-only selection).
+
+**The entire DAW-verification obligation remains outstanding.** The null test on Ρ's
+own output, the three folder cases, collapsed-mono placement and summing, both mode
+transitions waited out past a panel timer tick, undo, name/colour clone, and
+`GetProjectPathEx` against a non-default recording path — none of it is unit-testable
+and none has been run.