pk-doctor sensitive_data flags numeric constants and synthetic emails

[projectious]

When dogfooding processkit v0.27.1 in projectious-work/aibox, pk-doctor reports sensitive_data WARNs that appear to be false positives:

• cli/src/seed.rs lines with byte-size thresholds like 1073741824 are matched as phone numbers.
• context notes containing synthetic example addresses like dev@example.com are matched as email-address WARNs, while similar example addresses are already allowlisted.

Expected: deterministic sensitive-data scan should suppress obvious numeric constants and common synthetic documentation emails, or classify them as non-actionable examples.

Observed with processkit v0.27.1 during aibox v0.27.3 integration.