feat(think): --skip-talents flag to gate segment-talent dispatch
Adds opt-in --skip-talents NAMES to suppress dispatch of named segment-scheduled
talents during --segments / --segment runs. Primary driver: realizer backfill
for the Apr 4-26 cliff, where awareness_tender + pulse account for ~80% of
per-segment wall-clock and aren't needed for realizer output. Default (flag
absent / empty) is byte-identical to current behavior; orthogonal to and composable with --no-activity-prompts.
Co-Authored-By: Codex <codex@openai.com>