docs: add YIP-75 (Launch V3)

[BobTheBuidler]

Summary

• Add YIP-75 covering the V3 launch proposal and specs.

Rationale

• Include the proposal in canonical YIP format with corrected overview and citations.

Details

• Adds references inline and in the References section

[murderteeth]

Issues

• yip-75.md:6 - status: Proposed appears incorrect. The governance forum confirms a Snapshot vote was conducted ("Voting is live for 5 days vote with veYFI at snapshot"), and V3 is deployed in production across Ethereum Mainnet, Polygon, Optimism, and Avalanche. If the vote passed, status should be Approved.
• yip-75.md:101 - Minor typo: "Contract Addressses" (triple 's').

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This review was conducted using the review-pr skill.

[BobTheBuidler]

Addressed the requested changes in commit dac9110.

Fixed:

• YIPS/yip-75.md:6 status changed from Proposed -> Approved.
• YIPS/yip-75.md:89 typo corrected from Contract Addressses -> Contract Addresses.

Validation:

• bundle exec yip_validator YIPS/yip-75.md => total:1, valid:1, invalid:0, errors:0

Snapshot evidence:

• https://snapshot.org/#/veyfi.eth/proposal/0xdb02fe93b77c6addfa9b197bb47f5b6d7779f69000210cffe54ea1fb35b91eec
• Closed with scores: For 193.6075443058311, Against 38.341597166001385