feat: add Daily Claude Token Usage Analyzer workflow (#1605)

* feat: add Daily Claude Token Usage Analyzer workflow

Mirrors the existing Copilot Token Usage Analyzer but focused on
Claude/Anthropic-engine workflows (smoke-claude, secret-digger-claude,
security-review, security-guard).

Key differences from the Copilot analyzer:
- Filters for provider=anthropic in token-usage.jsonl
- Includes cache_write_tokens in analysis (Anthropic exposes this)
- Adds cache write rate metric
- Uses Anthropic pricing tiers (Sonnet/Haiku/Opus)
- Separate skip-if-match label (claude-token-usage-report)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: rename 'Billable tokens' to 'Full-price tokens' and clarify cost section

Agent-Logs-Url: https://github.com/github/gh-aw-firewall/sessions/1ea1df07-9ddd-4b4d-a83e-db6ac24214bd

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

Author: 3 people