docs(connectors): plan Drive binary ingestion

[kl3inIT]

Summary

• add the active Google Drive PDF/DOCX binary-ingestion design and execution plan
• record the pinned Onyx comparison, complete Drive gap register, and independent Fable 5 architecture challenge
• bind the seven challenge must-fixes: binary raw payloads, explicit job kind, MIME/suffix rules, completeness split, tracked transfer reservation, SHA-256 identity, and connector ownership
• place the increment ahead of reproducible demo ingestion and remove the stale format-coverage backlog claim

Verification

• py -3 scripts/check_docs.py
• git diff --check

Scope

Documentation and architecture only. No connector, persistence, authorization, or publication code changes.

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⛔ Files ignored due to path filters (5)

• docs/increments/active/2026-08-15-google-drive-binary-ingestion/challenge-brief.md is excluded by !docs/**
• docs/increments/active/2026-08-15-google-drive-binary-ingestion/challenge-verdict.md is excluded by !docs/**
• docs/increments/active/2026-08-15-google-drive-binary-ingestion/design.md is excluded by !docs/**
• docs/increments/active/2026-08-15-google-drive-binary-ingestion/plan.md is excluded by !docs/**
• docs/roadmap.md is excluded by !docs/**

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[kl3inIT]

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