fix(audience): add @imtbl/audience to publish workflow version-seeding filter

PR #2838 shipped the build fixes that make @imtbl/audience installable
as a standalone npm package. However, the first publish run after merge
(workflow run 24182647672) was unable to actually publish the fixed
artifact because of a version collision:

  Skipped package "@imtbl/audience" because v0.0.1-alpha.0 already
  exists in https://registry.npmjs.org/ with tag "alpha"

## Root cause

The "Initialize current versions" step in publish.yaml seeds package
versions from @imtbl/metrics for packages inside the @imtbl/sdk... and
@imtbl/checkout-widgets... dependency trees. Each SDK-family package
has "version": "0.0.0" committed in source (as a template); the
Initialize step is the source of truth at publish time.

@imtbl/audience isn't in either of those dependency trees, so it never
gets seeded. nx release reads the committed template value 0.0.0 from
disk and computes 0.0.1-alpha.0 — which was burned on 2026-04-08 by an
earlier publish attempt that pushed the pre-2838 broken build (no
prepack stripping, @imtbl/audience-core still listed as a runtime dep
pointing at a package that's never published since it's private).
The registry refuses to overwrite, so every publish run skips audience
indefinitely.

Evidence the npm copy is still the broken pre-2838 artifact:

  $ npm view @imtbl/audience@0.0.1-alpha.0 dependencies --json
  {"@imtbl/audience-core": "0.0.1-alpha.0"}

  $ npm view @imtbl/audience@0.0.1-alpha.0 time.created
  2026-04-08T04:43:20.487Z   # one day before PR #2838 merged

  $ npm view @imtbl/audience-core versions
  E404 Not Found             # private, never published

  $ cd /tmp/fresh && npm install @imtbl/audience@0.0.1-alpha.0
  E404 on @imtbl/audience-core@0.0.1-alpha.0

PR #2838's body explicitly flagged this as unverified:

  > nx release should bump it to match the rest (since
  > projectsRelationship is fixed) — but this hasn't been independently
  > verified.

Verified now: projectsRelationship: fixed does NOT make nx reconcile
different starting disk versions. It just means all projects bump under
the same release cycle with the same specifier. Without an explicit
filter entry in the Initialize step, audience's disk 0.0.0 is read
as-is and bumps to 0.0.1-alpha.0.

## Fix

Add --filter @imtbl/audience... to the Initialize current versions
step. This seeds @imtbl/audience AND @imtbl/audience-core (via the ...
transitive-deps suffix) to the latest @imtbl/metrics version from npm
on every publish run, matching the pattern used for every other
SDK-family package. No source-version changes needed — audience
follows the existing convention where source stays at 0.0.0 and the
Initialize step is the canonical version writer.

## Expected behaviour on next publish

1. Initialize current versions: reads latest metrics version from npm
   (e.g. 2.15.0-alpha.20), writes it to all SDK-family package.json
   files including audience + audience-core.
2. Setup new package versions (nx release): bumps every seeded package
   from the metrics version to the next prerelease (e.g.
   2.15.0-alpha.21) — audience/audience-core in lockstep with the
   rest of the SDK family.
3. Pack: prepack strips @imtbl/audience-core from audience's
   dependencies, postpack restores, producing imtbl-audience-<new>.tgz
   with no workspace references.
4. Release to NPM: publishes @imtbl/audience at the fresh version slot
   — no collision, because this slot has not been burned.
5. npm install @imtbl/audience@<new-version> in a fresh project
   resolves and installs cleanly.

Refs: SDK-66, SDK-63

Author: ImmutableJeffrey

.github/workflows/publish.yaml

@@ -99,7 +99,7 @@ jobs:
           git config user.email "platform-sa@users.noreply.github.com"
 
       - name: Initialize current versions
-        run: pnpm --filter @imtbl/sdk... --filter @imtbl/checkout-widgets... exec sh -c "jq --arg version \"$(npm view @imtbl/metrics versions --json | jq -r '.[-1]')\" '.version = \$version' package.json > package.tmp.json && mv package.tmp.json package.json"
+        run: pnpm --filter @imtbl/sdk... --filter @imtbl/checkout-widgets... --filter @imtbl/audience... exec sh -c "jq --arg version \"$(npm view @imtbl/metrics versions --json | jq -r '.[-1]')\" '.version = \$version' package.json > package.tmp.json && mv package.tmp.json package.json"
 
       - name: Setup new package versions
         run: pnpm nx release version --specifier ${{ env.RELEASE_TYPE }} $( ${{ env.DRY_RUN }} && echo "--dry-run" || echo "")