fix(t3x): pin sync-escalation gh calls to the fork (GH_REPO)

[radroid]

Problem

The daily t3x upstream sync and t3x weekly verify escalation steps kept failing with failed to open t3x-sync issue — even after PR #12. No t3x-sync issue was ever opened, so the resolve-agent handoff channel stayed silent.

Root cause (not the PR #12 label race)

The Configure git step adds a remote named upstream → pingdotgg/t3code (the parent). gh's base-repo resolution ranks a remote named upstream above origin, so every un-pinned gh call in the escalate step targeted the parent repo, where GITHUB_TOKEN has no write access → gh issue create returns 403 → empty URL → the error. The 2>/dev/null on the create hid the real 403.

Reproduced empirically (gh 2.96.0): with origin=fork + upstream=parent and no --repo/GH_REPO, gh issue list returns the parent's issues; the fork returns [].

Fix

• Add step-level GH_REPO: ${{ github.repository }} to both escalation steps — pins all gh subcommands (label create / issue list / comment / create / edit) to the fork.
• Stop swallowing stderr on gh issue create (keep || true for set -e) so any future failure is visible in the run log.

Verification

Dispatched t3x-upstream-sync on this branch (dry-run). The real rebase conflict in docs/t3x/SEAMS.md triggered escalation, and it now opens the issue:

https://github.com/radroid/t3code/issues/17
::notice::opened new t3x-sync issue #17

(The run still ends red on purpose — the escalate step exit 1s so the failed sync stays visible in the Actions tab.)

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