Preserve rate units and reject invalid capacity counts

[SummusStuprator]

Capacity summaries currently advertise $100/day as $100/hr, and interpret -2 or 2.5 agents as a positive whole agent count. Those values feed the derived hourly total shown to employers.

Two separate commits keep the parsed summary from inventing that information:

• Recognize explicit non-hourly units (time periods and task/project prices) and leave the hourly rate unstated. The agent count still displays with “rate on request”; the original resume remains unchanged. Existing hourly and implicit-hourly inputs retain their behavior.
• Parse the sign and decimal portion of a count before requiring a positive whole number. Supported prose such as “up to 10” and comma-grouped counts continues to work.

Validation: both failures reproduced before fixing; four new tests cover rejected and retained values, including parseCapacity/formatCapacity integration. TypeScript build and 25 focused capacity tests pass. Prepared by an AI coding assistant with the account owner's authorization; no live data used.