Use main as the default branch name

.github/workflows/build.yml

@@ -4,16 +4,16 @@ name: Build
 on:
   workflow_dispatch:
   pull_request:
-  # Runs on master so each merge records the APK metrics that pull requests are
+  # Runs on main so each merge records the APK metrics that pull requests are
   # compared against. Without this there is no baseline and the size report on a PR
   # can only show absolute numbers.
   push:
     branches:
-      - master
+      - main
 
 permissions:
   contents: read
-  # Needed to list master's workflow runs and download their metrics artifact
+  # Needed to list main's workflow runs and download their metrics artifact
   actions: read
 
 jobs:
@@ -126,13 +126,13 @@ jobs:
 
       # Best effort: a first run, a deleted artifact or an expired retention window all just
       # mean there is no baseline to compare against, which is not a reason to fail the build.
-      - name: Fetch baseline metrics from master
+      - name: Fetch baseline metrics from main
         if: github.event_name == 'pull_request'
         continue-on-error: true
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
-          run_id=$(gh run list --workflow build.yml --branch master --status success \
+          run_id=$(gh run list --workflow build.yml --branch main --status success \
             --limit 1 --json databaseId --jq '.[0].databaseId')
           if [ -n "$run_id" ]; then
             gh run download "$run_id" --name apk-metrics --dir baseline
@@ -147,8 +147,8 @@ jobs:
             if [ -f baseline/apk-metrics.json ]; then
               python3 scripts/apk-metrics.py compare baseline/apk-metrics.json apk-metrics.json
             else
-              echo "No master baseline available yet, so this run reports absolute numbers only."
-              echo "A baseline is recorded on the next push to master."
+              echo "No main baseline available yet, so this run reports absolute numbers only."
+              echo "A baseline is recorded on the next push to main."
               echo
               echo '```json'
               cat apk-metrics.json

CLAUDE.md

@@ -181,7 +181,7 @@ audio sync, decoder behaviour — document it there with the symptom to check, a
 alone until someone can verify it.
 
 CI runs unit tests as a job independent of the build, and reports APK size and DEX method count
-against master (`scripts/apk-metrics.py`). Those two numbers are the only performance signal CI
+against main (`scripts/apk-metrics.py`). Those two numbers are the only performance signal CI
 can honestly provide; they move when the shrinker config or dependency tree changes.
 
 ---

HARDWARE_TESTING.md

@@ -387,7 +387,7 @@ it is switched on.
 > hardware time than has gone into it.
 >
 > Source: commit `810858bf` on `feature/audio-observability`, which also carries the readback
-> instrumentation the measurement depends on. That instrumentation is **not** on master, so
+> instrumentation the measurement depends on. That instrumentation is **not** on main, so
 > reproducing these numbers here means building that branch.
 
 ---

README.md

@@ -126,7 +126,7 @@ Taken on an Android TV box streaming Steam from Sunshine.
 * Raising minSdk to 30 removed 111 OS-version checks and the rooted build flavour; the branch is
   roughly 48,000 lines lighter than upstream.
 * A JVM unit test suite (`./gradlew testDebugUnitTest`) with coverage, run by CI alongside the
-  build; CI also reports APK size and DEX method count against master.
+  build; CI also reports APK size and DEX method count against main.
 
 ### Removed