PDF Craft v2.6.5

PDF Craft 2.6.5 adds translation-size previews and operation-scoped resource
reports, so applications can inspect source words before execution and observed
remote consumption after completion, failure or cancellation.

• New pcex_words_count and epub_words_count read-only queries share the actual
  translation pre-scan and source-word rules. Matching options produce the same
  total as translation's STARTED.total_words. Both Craft facades expose methods;
  the async facade keeps parsing outside the event loop.
• New UsageCollector, UsageReport, Usage and RequestUsage group observed
  requests and input/output/cache-hit input tokens by original provider object.
  Pass usage= to model-calling operations and inspect usage.report() without
  changing the operation's existing return type.
• Accepted and discarded consumption are separated as effective and wasted,
  including transport retries and business validation loops. Missing usage is not
  estimated. Provider prompt cache is distinguished from ordinary input; local
  cache hits do not create external consumption.
• Support LLM, JEV and OCR vendors. OCR counts recognition submissions rather than
  pages, authentication calls or polling. Existing OCRTokensMetering is retained.
• Classify translation and fill consumption for withdrawn PCEX metadata collections
  as wasted, including otherwise valid members of an incomplete subjects list.
  Independent accepted fields retain their effective consumption. Collections are
  translated separately from scalar fields so their usage can be settled accurately.
• Adopt doc-page-extractor 1.2.2 and clip second-pass vendor OCR boxes against the
  actual redaction masks. This prevents later-stage detections from extending into
  previously recognized regions, including oversized footer boxes that blocked PDF
  translation writeback. See #545.
• Read PCEX queue readiness and results from one SQLite snapshot, avoiding a race
  where online rendering or callbacks could read an unfinished result during scanning.
• See usage and sizing or 中文说明 for examples,
  the accounting boundaries, and limitations. PCEX v4 and progress events are unchanged.

Resource reporting and task sizing: #550.

Full Changelog: v2.6.4...v2.6.5