One reader for a declaration file, because there were three

Found raising two machines: `apply <file>` refused the bundle example in
this repository with `invalid character '/'`. The bundle strips whole-line
comments; apply handed the raw bytes to the parser. So a file this repo
ships could be built into a binary and not applied from disk.

This is the third instance of one fault. There is already a test here
named "what validates is what is applied", written when `mesh-host
bundle` said yes and `reconcile` said no about the same artefact — two
paths to one thing, disagreeing. Fixing that instance left the shape
intact, so it came back somewhere else.

So the fix is structural rather than local: `declaration.ParseFileTrusted`
is the one way to read a declaration from disk, and the bundle and apply
both use it. Comment handling and its test now live in one place, since
having them in two is how it came to be done in two.

The wire format is untouched — over the link it stays exactly JSON,
because a format with a second thing to strip is a format with a second
thing to disagree about. Asserted, and confirmed to fail if the link
starts stripping.

internal/bundle/bundle.go

@@ -78,22 +78,5 @@ func Load(system string) (*declaration.Declaration, error) {
 	// ParseTrusted: the bundle arrives with the binary, so it may carry actions the link may
 	// not (novox/hq ADR 0005). The bootstrap needs them — creating the control plane's database
 	// happens before there is any mesh to ask for one.
-	return declaration.ParseTrusted(stripComments(locks[system]))
-}
-
-// stripComments removes whole-line `//` comments so a bundle can be annotated.
-//
-// It is JSON on the wire and a pinned, hand-authored artefact here, and a pinned thing nobody
-// can annotate is a pinned thing nobody can review. Only whole lines: anything cleverer would
-// need to know where strings begin and end, and a parser that half-understands its input is
-// worse than one that does not try.
-func stripComments(raw []byte) []byte {
-	var kept []string
-	for _, line := range strings.Split(string(raw), "\n") {
-		if strings.HasPrefix(strings.TrimSpace(line), "//") {
-			continue
-		}
-		kept = append(kept, line)
-	}
-	return []byte(strings.Join(kept, "\n"))
+	return declaration.ParseFileTrusted(locks[system])
 }