ci(audience-sdk): scope path filters to source-affecting paths only (SDK-268)

Replaces the blanket src/Packages/Audience/** and examples/audience/**
match with explicit allow-lists, so doc-only PRs (README.md, gitignore,
etc.) no longer schedule the 12-cell PlayMode matrix or the .NET unit
tests.

Triggers now require a change to one of:
  - src/Packages/Audience/Runtime/**
  - src/Packages/Audience/Tests/**
  - src/Packages/Audience/package.json
  - src/Packages/Audience/Directory.Build.props
  - src/Packages/Audience/link.xml         (IL2CPP stripping config)
  - examples/audience/Assets/**            (sample-app workflow only)
  - examples/audience/Packages/**          (sample-app workflow only)
  - examples/audience/ProjectSettings/**   (sample-app workflow only)
  - the workflow file itself

paths-ignore is not viable here: it only suppresses a workflow when
every changed file matches the ignore list, so a mixed PR (markdown +
package.json) would still trigger. Allow-listing is the only filter
shape that handles this correctly.

package.json stays in the trigger because real version, dependency,
and unity-minimum changes live there and the matrix is exactly what
should catch a typo. The cost of running on a metadata-only edit is
the price of treating package.json as load-bearing.

link.xml is included because it controls which managed types survive
IL2CPP stripping in Player builds. A change there can produce
runtime-only failures that only the PlayMode matrix can catch.

Linear: SDK-268

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ImmutableJeffrey

.github/workflows/test-audience-sample-app.yml

@@ -3,8 +3,14 @@ name: Audience SDK — PlayMode (IL2CPP + Mono)
 on:
   pull_request:
     paths:
-      - 'src/Packages/Audience/**'
-      - 'examples/audience/**'
+      - 'src/Packages/Audience/Runtime/**'
+      - 'src/Packages/Audience/Tests/**'
+      - 'src/Packages/Audience/package.json'
+      - 'src/Packages/Audience/Directory.Build.props'
+      - 'src/Packages/Audience/link.xml'
+      - 'examples/audience/Assets/**'
+      - 'examples/audience/Packages/**'
+      - 'examples/audience/ProjectSettings/**'
       - '.github/workflows/test-audience-sample-app.yml'
   workflow_dispatch:
 

.github/workflows/test-audience-sdk.yml

@@ -4,11 +4,19 @@ on:
   push:
     branches: [main]
     paths:
-      - 'src/Packages/Audience/**'
+      - 'src/Packages/Audience/Runtime/**'
+      - 'src/Packages/Audience/Tests/**'
+      - 'src/Packages/Audience/package.json'
+      - 'src/Packages/Audience/Directory.Build.props'
+      - 'src/Packages/Audience/link.xml'
       - '.github/workflows/test-audience-sdk.yml'
   pull_request:
     paths:
-      - 'src/Packages/Audience/**'
+      - 'src/Packages/Audience/Runtime/**'
+      - 'src/Packages/Audience/Tests/**'
+      - 'src/Packages/Audience/package.json'
+      - 'src/Packages/Audience/Directory.Build.props'
+      - 'src/Packages/Audience/link.xml'
       - '.github/workflows/test-audience-sdk.yml'
 
 jobs: