ci(sdk): add proto drift detection and sync notifications

[Ygnas]

Summary

Add daily CI workflow that detects proto drift in Go and TypeScript SDKs, runs build checks when drift is found, and auto-manages GitHub issues (create/update on breakage, close on resolution).

Related Issue

Closes #2825

Changes

• .github/workflows/sdk-sync-dashboard.yml — New workflow: runs daily at 06:00 UTC, checks both SDKs in a single job, manages drift issues per-SDK via matrix strategy
• tasks/go.toml — Two new tasks: go:proto:drift (generates fresh protos to a tmpdir, diffs against committed files, outputs JSON report) and go:proto:build-check (delegates to shared build check script)
• tasks/scripts/sdk_build_check.sh — Generic step runner: executes a sequence of mise tasks, captures logs, outputs structured pass/fail JSON
• tasks/scripts/sdk_sync.py — Issue management CLI: generates issue bodies with drift tables, build logs, fix commands, and an agent-consumable prompt; deduplicates by label

Testing

• mise run go:proto:drift — outputs valid JSON when in sync (exit 0) and detects drift when a proto file is modified (exit 1, correct JSON)
• mise run go:proto:build-check — reports success when gen/build/test pass
• mise run sdk:ts:proto:drift — outputs valid JSON when in sync
• mise run sdk:ts:proto:build-check — reports success when gen/typecheck/test pass
• sdk_sync.py generate_issue_body — produces correct issue body for both Go and TypeScript
• mise run pre-commit passes
• Verify workflow runs successfully via workflow_dispatch

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)

cc @rhuss

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