fix(create-objectstack): track declared bin as executable (#11075)

* fix(create-objectstack): track declared bin as executable

The declared bin packages/create-objectstack/bin/create-objectstack.js
was tracked 100644 despite having a shebang and being pnpm's bin link
target. pnpm chmods it to 755 on every install, and with
core.fileMode=true that registers as a tracked mode change in every
fresh worktree — a file nobody edited shows up dirty, and a routine
git add -A can sweep it into an unrelated PR.

Matches the sibling declared bin packages/cli/bin/run.js, which is
already tracked 100755. Mode-only change; blob content and hash are
unchanged.

* chore: add changeset for create-objectstack bin exec bit fix

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: Elon Musk

.changeset/create-objectstack-bin-exec-bit.md

@@ -0,0 +1,13 @@
+---
+"create-objectstack": patch
+---
+
+Fix the declared bin (`bin/create-objectstack.js`) being tracked non-executable
+in git. It carries a `#!/usr/bin/env node` shebang and is pnpm's link target
+for the `create-objectstack` command, but was committed `100644` instead of
+`100755` — matching the sibling declared bin `packages/cli/bin/run.js`, which
+was already tracked executable.
+
+Patch bump: this is a packaging-mode correction with no content, API or
+behavior change (the blob hash is identical) — it only fixes how the file is
+tracked in git and therefore how it is packed for npm.