release: v0.6.7 (unify go+ts, patch bump)

[rjrodger]

M7 release wave, last batch of grammar packages. feed requires xml, which
published at 0.7.7 earlier in the wave — that is what unblocks this one.

What changed

0.6.6 → 0.6.7 across the three gated version sites (ts/package.json, the TS
VERSION const, the Go VERSION const), and go/go.mod + go.sum lifted to
all five fleet requires: json/go v0.5.7, jsonic/go v0.6.6, parser/go
v0.9.0, support/go v0.3.4, xml/go v0.7.7.

ts/package-lock.json moves with them — @tabnas/debug → 0.3.6,
@tabnas/jsonic → 0.6.6, @tabnas/railroad → 0.3.6, @tabnas/xml → 0.7.7.
Only the lockfile pins move; peer ranges stay open (>=0), the fleet
convention.

Verification

Against already-published dependencies, clean install (npm i --no-package-lock, so local link.sh symlinks cannot taint resolution):

• TS: 112/112 pass, including the third-party corpora the pretest hook
  fetches — among them the 18 not-well-formed feedparser documents (14
  annotated Expect: SAXError plus the 4 reclassified ones), which is the
  case most sensitive to an engine change
• Go: GOWORK=off go build ./... && go test ./... green

Releasing

Merge, then dispatch release.yml from main with go: true: it publishes
@tabnas/feed@0.6.7 over OIDC and writes ts/v0.6.7 + go/v0.6.7 in one
atomic push.

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