fix(pixel-agent-teams): guard non-string input type in planned_count resolution

[Vishaaallll]

Why this matters

In ods/extensions/services/dashboard-api/pixel_agent_teams.py, planned_count(text) performs text[:12000] within a try block catching (ValueError, TypeError). However, passing a non-subscriptable object or non-string type still triggers a TypeError exception path instead of cleanly returning None immediately.

This surgical fix adds an explicit if not isinstance(text, str): return None guard, ensuring deterministic return behavior without relying on exception handling for standard type checks.

Validation

• Baseline reproduction: verified that planned_count(None) raised and caught TypeError internally.
• Post-fix behavior: immediately returns None for non-string types.
• Telemetry: pixel-teams suite: 2 passed. New-test syntax and diff checks pass; new regression wired into Linux CI.

Overlap check

Inspected open/closed PRs. PR #5722 handled multibyte UTF-8 SSE decoding in pixel-teams; zero overlap with planned_count parser.

Risk / AI disclosure

AI-assisted investigation, patch, and regression tests. Restricts input type handling in team count extraction. Independent review remains a gate.

Follow-up integration evidence

Composed locally with public-beta at 4fa6ad170 without conflicts. CI and unit checks pass.

[Lightheartdevs]

Thanks for this contribution. public-beta was promoted into main on 2026-09-24 and no longer receives changes, so we're closing pull requests that target it. This isn't a judgment on the change itself. If it's still needed, please rebase onto main and open a focused PR. See #7253 for details and the contribution policy.