fix(pixel-agent-teams): validate count range in roles_for resolution

[Vishaaallll]

Why this matters

In ods/extensions/services/dashboard-api/pixel_agent_teams.py, roles_for(count) looks up count in a dictionary mapping 1..6 directly without parameter type checking. When invoked with out-of-range integers or types such as True (which Python resolves as key 1), the function either silently behaves incorrectly or raises an unhandled KeyError instead of a standard ValueError.

This surgical fix validates that count is strictly an int (not a boolean) between 1 and 6, raising ValueError on invalid values.

Validation

• Baseline reproduction: verified that roles_for(0) and roles_for(True) caused KeyError or unexpected single-builder resolution.
• Post-fix behavior: cleanly raises ValueError("count must be an integer between 1 and 6").
• 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 addressed multibyte UTF-8 SSE decoding in pixel-teams; zero overlap with team role resolution.

Risk / AI disclosure

AI-assisted investigation, patch, and regression tests. Adds strict argument verification to internal helper. Independent review remains a gate.

Follow-up integration evidence

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