fix(nwsync): declare Frame_Content_Size on every blob, and verify what is published (#87)

Closes #86. Closes #85.

These land together on purpose. Fixing the encoder alone changes nothing for the blobs already in the zone, because `emit` skips whatever is already present.

## #86 — the framing fix

`klauspost/compress` omits the zstd `Frame_Content_Size` field for inputs under 256 bytes, which the format permits. Reference libzstd never does, so the NWN client — which sizes its output buffer from `ZSTD_getFrameContentSize` and has therefore never met a frame without one — rejected roughly 6% of our blobs outright. Any single one stops a sync dead, so no client could complete a sync of the live manifest.

No encoder option changes this, so `compressBlob` re-headers the affected frames into the shape libzstd itself emits: `Single_Segment_flag` set, `Window_Descriptor` dropped, and the freed byte spent on a one-byte `Frame_Content_Size`. Same length in, same length out, and the same descriptor byte (`0x24`) the issue recorded from libzstd.

`compressBlob` then asserts its own output. An encoder upgrade that finds another way to omit the field would otherwise reproduce #86 in silence, and a blob is skipped by every later emit once written.

`emitter_version` goes to `2`, so `assemble` refuses to merge an index written by the encoder that omitted the field.

**Proved against the reference decoder, not just a round trip.** A real emitted 175-byte blob:

```
Frames  Skips  Compressed  Uncompressed  Ratio  Check  Filename
     1      0      48   B       175   B  3.646  XXH64  frame.zst
c59d6620d4ffd4bf3fe73df43b19b7afcfe8fea4  -            <- zstd -dc | sha1sum
c59d6620d4ffd4bf3fe73df43b19b7afcfe8fea4               <- the blob's own name
```

Before the fix that `Uncompressed` column was blank.

## #85 — `nwsync verify`

`crucible nwsync verify <manifest-sha1>` reads a manifest and its blobs back through the **public pull zone**, with no credential, because what matters is the bytes a client is served, edge behaviour included. Every distinct blob is decompressed and hashed; failures are reported per blob as missing / malformed framing / size mismatch / hash mismatch, and the exit code is 1.

- `--sample N` makes a routine check cheap against a manifest that is ~69,000 blobs and 15 GB; the default is a full sweep.
- `--base URL` / `NWSYNC_PULL_BASE` overrides the public host.
- The manifest is checked against its own sha1 before a single blob is fetched.
- `emit --verify` applies the same check where `emit` would otherwise trust presence, and replaces a stored blob that is not what its name claims. This is what makes the #86 blobs repairable.

## Why the existing checks missed this

Both new checks assert the **frame property**, not just a round trip. The conformance suite (#59) compares decompressed bytes, so a frame that decodes correctly passes regardless of its header; and the earlier zone audit decompressed 68 blobs with the `zstd` CLI, a *more* capable decoder than the client's, which certified exactly the blobs the client rejects.

## Checks

`make check` and `make smoke` green. Second commit is the fixes from a two-axis review of the first.

## Not in this PR

Three follow-ups, filed separately: the backfill has not been run, replacing a blob does not purge the pull-zone edge cache, and #85's runbook line belongs to `sow-platform`.

🤖 Generated with [Claude Code](https://claude.com/claude-code)Reviewed-on: #87

Co-authored-by: vickydotbat <vickydotbat@tutamail.com>

internal/nwsync/nwsync_test.go

@@ -501,3 +501,31 @@ func TestRunUsageErrors(t *testing.T) {
 		}
 	}
 }
+
+// TestEveryBlobDeclaresItsFrameContentSize guards the fault that stopped every
+// client sync (#86): klauspost/compress omits Frame_Content_Size for inputs
+// under 256 bytes, and the game client cannot decode a frame without it. This
+// asserts a frame property, not a round trip — the zstd CLI and Go's decoder
+// both stream such a frame happily, so round-tripping cannot see the defect.
+func TestEveryBlobDeclaresItsFrameContentSize(t *testing.T) {
+	// 230 and 175 are real sizes from the manifest that failed to sync; 255/256
+	// straddle the encoder's threshold.
+	for _, size := range []int{1, 32, 175, 230, 255, 256, 257, 1024, 5000} {
+		payload := make([]byte, size)
+		for i := range payload {
+			payload[i] = byte('a' + i%26)
+		}
+		blob := compressBlob(payload)
+		if !frameDeclaresContentSize(blob[blobHeaderBytes:]) {
+			t.Errorf("blob of %d bytes declares no frame content size (descriptor %#x)",
+				size, blob[blobHeaderBytes+4])
+		}
+		got, err := decompressBlob(blob)
+		if err != nil {
+			t.Fatalf("decompress %d-byte blob: %v", size, err)
+		}
+		if !bytes.Equal(got, payload) {
+			t.Errorf("%d-byte blob did not round trip", size)
+		}
+	}
+}