chore(ios): give git worktrees the Honeycomb key

[i11v]

Requested by Ilnur · project thread

Before: apps/ios/Local.xcconfig, which holds the Honeycomb ingest key, is gitignored, so a new git worktree doesn't get it. #include? "Local.xcconfig" then silently includes nothing, and the worktree's iOS build runs with no key and sends no telemetry, with no sign that anything is wrong.

After: creating a worktree symlinks the main checkout's Local.xcconfig into it. Any build that still has no key (a temp copy, a CI build) shows the Xcode build warning "HONEYCOMB_API_KEY is empty, so this build sends no telemetry".

How

• scripts/link-local-config.sh finds the main checkout from git rev-parse --git-common-dir and symlinks apps/ios/Local.xcconfig into the current worktree when it is missing there. It does nothing in the main checkout or when the file already exists, and you can run it by hand in a worktree made before this change.
• lefthook.yml gains a post-checkout job that runs the script, so git worktree add triggers it. The installed hook calls lefthook by the main checkout's absolute path, so it also works in a fresh worktree with no node_modules.
• The apps/ios/project.yml pre-build script prints the warning when HONEYCOMB_API_KEY is empty.
• apps/ios/README.md documents both.

Tested here: the script is a no-op in the main checkout, links once in a worktree and is idempotent on a second run. After lefthook install, a plain git worktree add created the symlink through the hook. I couldn't run XcodeGen or Xcode here, so the pre-build script is checked only by the iOS CI build.

After merging: run bun install (or bunx lefthook install) once in the main checkout to install the new post-checkout hook. For worktrees that already exist, run scripts/link-local-config.sh in each.

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