chore(release): batch split-repo lookup and auto-create from release.sh

[markshust]

Why

During the 0.5.0 release, the split workflow failed for the three new inertia companion packages (marko-inertia-react, marko-inertia-vue, marko-inertia-svelte) because their split repos didn't exist on GitHub yet — bin/create-split-repos.sh hadn't been re-run since the packages were added. The fix at the time was manual: run the script, then re-trigger the failed workflow runs.

This shouldn't be a post-failure manual step. The release script should ensure the split repos exist before pushing.

What

bin/create-split-repos.sh

Three changes, all backwards-compatible (./bin/create-split-repos.sh with no args still works exactly as before):

1. Single batched API call. The previous version did N sequential gh repo view calls (one per package), taking 30-60s for 77 packages. The new version makes one gh repo list call and compares the results locally with grep, completing in ~1s.
2. Optional positional args. Pass package names to scope the check: ./bin/create-split-repos.sh inertia-react inertia-vue. With no args, every directory under packages/ is checked.
3. --dry-run flag. Preview what would be created without any API mutations.

The script also validates each package's local directory exists before attempting to create its split repo, with a warning if not (catches typos in args).

Design note: no local state file. GitHub is the source of truth — the script fetches fresh on every run. No published-repos.txt to maintain, no drift risk if a repo is created/deleted out-of-band, nothing to commit after releases. Speed comes from batching one API call instead of N, not from caching.

bin/release.sh

Invokes bin/create-split-repos.sh between the changelog commit and the main-branch push. The split workflow fires on both the main push and the tag push, so the split repos must exist before either. The 1-second cost is trivial relative to the rest of the release.

.claude/release-process.md

• Added new step 9 documenting the auto-invocation (renumbered subsequent steps).
• Updated the troubleshooting note for the missing-split-repo case to reflect that this is now rare, and to document the new args/dry-run modes.

Verification (all run locally before opening this PR)

• ./bin/create-split-repos.sh --dry-run → 0 created, 77 already exist, completed in 1.2s
• ./bin/create-split-repos.sh --dry-run inertia-react inertia-vue inertia-svelte → 0 created, 3 already exist, completed in 0.9s
• ./bin/create-split-repos.sh --dry-run nonexistent-test-pkg → correctly warns "packages/nonexistent-test-pkg does not exist — skipping"
• Simulated would-create path with a temporary fake package dir → correctly printed "Would create marko-php/marko-test-fake-pkg-pretend"
• bash -n bin/create-split-repos.sh and bash -n bin/release.sh both pass syntax check
• No production code touched — bin/ scripts and docs only

Test plan for the next release

The next time ./bin/release.sh X.Y.Z runs, it will print "Verifying split repos exist for all packages..." between the changelog commit and the main push. If everything is in order, it'll show "Done: 0 created, N already existed" in ~1s and proceed normally.

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