#72 fix(cost): derive local costs from token pricing

Summary

• Add ADR 0011 for token-derived local report cost semantics.
• Ignore app/vendor cost fields in local parsers and always derive UnifiedMessage.cost through Tokscale pricing.
• Drop cost-only rows and disable both Crush and Warp usage rows until token-level sources exist.
• Bump source-message cache schema to rebuild cached app-reported costs.

Verification

• cargo test -p tokscale-core
• cargo test -p tokscale-cli
• cargo run -p tokscale-cli -- --no-spinner --json --client crush
• cargo run -p tokscale-cli -- --no-spinner --json --client opencode

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Summary by cubic

Local report costs now derive only from token pricing. Parsers ignore app/vendor spend, rows without positive tokens are dropped, and cost-only clients (Crush, Warp) are fully disabled and removed from scanning.

• Refactors

  • Token-only pricing: compute UnifiedMessage.cost from tokens via crate::finalize_token_priced_messages; strip embedded costs in parsers; normalize token buckets; skip zero-token rows; clean totals (including -0.0) in reports/TUI; offline totals are 0.0 without pricing.
  • Remove cost-only clients: delete crush/warp adapters and session parsers, drop their local scan paths, mark them as not locally parsed, update the scanner to ignore them, remove Warp cache checks and leftover scan/submit paths, and trim related CLI/tests.

• Migration

  • Bump source-message cache schema to 26; cache rebuilds on first run.

Summary by CodeRabbit

发布说明

• Bug Fixes

  • 统一成本口径：本地报告的费用仅从 token 使用量派生计算；当缺少正 token 时会丢弃/归零仅费用类信息，且聚合总成本会进行净化。
  • 相关会话/适配流程不再依赖供应商上报的费用字段；改进集成结果一致性。
  • 命令行离线模式下的成本输出断言更严格（缺少定价缓存场景 totalCost 现在精确为 0.0）。
  • 报表中对无 token 的 Warp/Crush 数据不再纳入，并更新本地告警文案。

• Chores

  • 更新缓存架构版本，触发缓存重建以适配新的定价语义。