chore(pin): bump .objectstack-sha to objectstack main 5e7cf63e71 at the freeze (objectstack#25727) (#13545)

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Part of objectstack-ai/objectstack#25727
Part of objectstack-ai/objectstack#25677

Clause-②: no
Metadata-protocol: none

## What changes

The final pin bump before objectui main freezes for the merge into
objectstack `ui/` (objectstack#25752 step 2). `.objectstack-sha` moves
from `5874d25302cbb80db675eddf1b69198073fbe2a9` to
**`5e7cf63e71d92198a77cc88ed22f34afb1e86cb6`**, the objectstack `main`
HEAD at 15:01Z. The branch was restarted from objectui `main` at
`3b7b04007f` (after #13526).

This is a one-line diff. `scripts/bump-objectstack.sh` rebuilt the pin
and the packed manifests in `.objectstack-pin/` came out byte-identical,
so `pnpm install` left `pnpm-lock.yaml` unchanged. The only
`packages/spec` change in the range is a `describe()` string in
`ui/page.zod.ts` plus a liveness ledger file. No changeset is owed,
because no published source changes.

## Verification (local)

| Gate | Exit / verdict |
|---|---|
| `scripts/bump-objectstack.sh --no-commit 5e7cf63e71` + `pnpm install`
| 0, diff is `.objectstack-sha` only |
| `check:installed-pin-claims` | OK (spec/client/formula = 18.1.0, lock
and tree agree) |
| `check:spec-symbols` | ✅ all four sections |
| `check-changeset-presence.mjs` | no changeset owed |
| `pnpm type-check` | reported in a follow-up comment |

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Session: `https://claude.ai/code/session_01K1ngdG6x8wAt8cjeVx2cSk`

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

Author: objectstack-fleet[bot]

.objectstack-sha

@@ -1 +1 @@
-5874d25302cbb80db675eddf1b69198073fbe2a9
+5e7cf63e71d92198a77cc88ed22f34afb1e86cb6