feat(mcp): add resumable long-PDF editing [testing needed]

[spetro511]

Important

Status: testing needed. This PR is intentionally opened as a draft pending maintainer/manual browser-extension testing.

Summary

• add a durable, resumable workspace for long PDF editing jobs
• add bounded and atomic PDF versioning, checkpointing, recovery, and exact operation tracking
• add secure browser-artifact ingestion with path/inode validation, pinned-descriptor SHA-256 verification, encryption rejection, and aggregate workspace quotas
• add PyMuPDF inspection/editing support and a constrained pdf.net browser playbook
• isolate paused jobs and unrelated execute_task calls from automatic lifecycle changes

Automated verification

• Prettier
• ESLint
• TypeScript typecheck
• all workspace tests
• MCP tests (49/49)
• all seven builds
• MCP package dry-run
• lock/recovery stress (5/5)
• Hermes MCP discovery (10 tools)
• independent exact-tree security and logic review

Testing needed

• exercise a real 20+ page PDF through the browser-extension/pdf.net workflow
• interrupt and resume a job across MCP/server restarts
• verify user-stop pause behavior and explicit resume behavior
• validate final output manually in a desktop PDF viewer

Authorship

Authored by spetro511 <surenpeter511@gmail.com>.

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