The loader collects every fail-fast defect and honors per-open skips

Phase 1 of the decision surface (01 ▸ Malformed input, settled
2026-07-31): BoardLoadFailure aggregates the walk's defects in walk
order — stop-at-first retires. Environmental failures (unreadable root,
not-a-directory) stay immediate single-defect throws: there is no walk
to collect from. A defective root index is recorded and the walk
continues into the children (nothing in the walk consults the parsed
root document — verified); a defective lane, card, or trash-entry index
records and skips its subtree, Re-check's whole-walk re-aggregation
being the designed loop for what hides beneath. load(skipping:) is the
per-open skip channel: a skipped path's item is omitted from the model
and surfaces as LoadWarning.userSkipped; root paths are unskippable by
construction. The reload-breakage banner carries the aggregate ("…and
N more"), single-defect sentences byte-identical to before. Two new
multi-defect fixture boards; suite 2591 green.

Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97

Fixtures/Malformed/skippable-defects.kanban/10000000-0000-4000-8000-000000000001/20000000-0000-4000-8000-000000000001/index.md

@@ -0,0 +1,7 @@
+---
+schema: 1
+kind: card
+order: 1024
+title: Intact Card
+---
+Stays on the board whatever is skipped — a skip omits the item it names, never its siblings.

Fixtures/Malformed/skippable-defects.kanban/10000000-0000-4000-8000-000000000001/20000000-0000-4000-8000-000000000002/index.md

@@ -0,0 +1,8 @@
+---
+schema: 2
+kind: card
+order: 2048
+title: From A Newer Lanework
+---
+Unfixable, so Skip is the only choice the surface offers for it. Skipped, the card leaves the
+board and this file stays on disk untouched.

Fixtures/Malformed/skippable-defects.kanban/10000000-0000-4000-8000-000000000001/index.md

@@ -0,0 +1,6 @@
+---
+schema: 1
+kind: lane
+order: 1024
+title: Intact Lane
+---

Fixtures/Malformed/skippable-defects.kanban/30000000-0000-4000-8000-000000000002/40000000-0000-4000-8000-000000000009/index.md

@@ -0,0 +1,8 @@
+---
+schema: 1
+kind: card
+order: 1024
+title: Perfectly Fine, Behind A Broken Lane
+---
+Nothing at all is wrong with this card. It is never in the snapshot regardless: its lane is either
+a defect or a skip, and both take the subtree.

Fixtures/Malformed/skippable-defects.kanban/30000000-0000-4000-8000-000000000002/index.md

@@ -0,0 +1,9 @@
+---
+schema: 1
+kind: lane
+order: 2048
+title: A Lane That Will Not Parse
+labels: [red, green
+---
+Unparseable YAML. Skipping it takes the whole lane out of the board — the intact card below
+included, which is the honest cost of the tolerance and why the notice names what left.

Fixtures/Malformed/skippable-defects.kanban/50000000-0000-4000-8000-000000000003/60000000-0000-4000-8000-000000000004/index.md

@@ -0,0 +1,7 @@
+---
+schema: 1
+kind: card
+order: 1024
+title: Last Card
+---
+Proof the walk kept going past the broken lane.

Fixtures/Malformed/skippable-defects.kanban/50000000-0000-4000-8000-000000000003/index.md

@@ -0,0 +1,6 @@
+---
+schema: 1
+kind: lane
+order: 3072
+title: Also Intact
+---

Fixtures/Malformed/skippable-defects.kanban/index.md

@@ -0,0 +1,11 @@
+---
+schema: 1
+title: Skippable Defects
+created: 2026-07-31T09:00:00Z
+---
+Every defect on this board is **below the root**, which is what makes it the skip channel's golden
+case: the root is never skippable, so a board whose only defects are skippable has to have an
+intact root.
+
+Skip both and it opens — without the broken lane, without the newer-schema card, and without the
+perfectly good card that lives under the broken lane.