[CMPAAAAAAAA-55] add outsourcing MVP technical proposal

[bigbear0102]

Linked Paperclip Issue

• CMPAAAAAAAA-55

Summary

• add a dedicated technical proposal for outsourcing-domain MVP candidates
• choose the internal operations control tower as the first MVP
• define the GitHub operating model and a 4-week delivery sequence

Risk Notes

• first design-partner workflow details are still partially hypothesis-driven
• billing export format remains spreadsheet-first until a concrete downstream format is confirmed

Verification Notes

• documentation-only change
• no runtime tests executed

[bigbear0102]

Superseded by active release path PR #4 stacked on PR #1. Keeping PR #1 as the thin-slice baseline base branch and removing this docs-only draft from the merge path.