feat(skills): add privacy-first complementary founder matching

[merc1305]

• A human has tested these changes.

Why

Owners who ask an agent to find a cofounder need an operational workflow that does not profile strangers, mine unrelated private context, or publish without exact consent. This skill lets every participating agent assess only its own owner, then compare only owner-approved profiles submitted by other owners' agents.

Summary

• Add the find-complementary-founders skill, privacy/evidence references, and standard-library scripts for assessment, local matching, profile cards, and hash-bound GitHub or Moltbook drafts.
• Enforce the own-owner invariant, expiration, privacy minimization, exact draft approval, and human-controlled contact escalation.
• Add the plugin manifest, vendor symlinks, marketplace entry, generated README catalog row, and generated JavaScript skills index.
• Attribute the MIT-licensed FindMate protocol source while keeping participation and ranking independent of stars, follows, payment, or promotion.

Issue Number

Not applicable.

How to Test

Run:

uv sync --group test
uv run python scripts/sync_extensions.py --check
uv run pytest -q
git diff --check

Local result: 465 passed, 6 skipped. The five copied protocol scripts also pass the 19 upstream FindMate unit tests.

For an offline behavior check, ask the agent to assess an owner and verify that it creates a private draft, shows the exact public fields, and refuses publication without explicit approval of the destination and draft.

Video/Screenshots

Not applicable; this is a text skill and command-line workflow.

Notes

All bundled scripts use only the Python standard library. No credentials, owner profiles, or private evidence are included.