Add bounty transparency lineage schema

[Jorel97]

Submission for the public AI lineage schema challenge:
https://www.reddit.com/r/aiagents/comments/1tr0a6j/open_challenge_build_a_traceable_ai_lineage/

Summary

• Adds tiinex.bounty-transparency.v1, a schema extending tiinex.evidence.v1 for public bounty commitments, submissions, judging decisions, and payout evidence.
• Adds a proof-of-use trace artifact for the same 1000 SEK challenge so the schema is exercised by a concrete record, not just described.
• Adds a small standard-library validator that checks required sections, commitment fields, funding totals, submission rows, decision status, and payout status.

Proof of use

python tools/validate_bounty_transparency.py .topics/bounty-transparency/001.trace.md

Expected/observed output:

OK bounty transparency artifact valid
commitments: 1000 SEK
submissions: 3
decision: pending
payout: pending

Why this fits the challenge

The challenge prompt suggested a bounty/funding transparency schema as a useful candidate. This PR makes that candidate concrete and lineage-compatible: promised funds, submitted artifacts, judging decisions, and payout evidence are separated into distinct traceable lanes.

[Tiinusen]

You are the first and only competitor, so if you are lucky you might receive the bounty with not much of an effort.

I myself I won't compete, but I will not make it easy for everyone so I will grab all the easy apples as soon as I get to them :P that includes a validator
(which I am working on right now aswell, but it is going meh, prehaps tomorrow when I stop responding Reddit posts and create meme pictures)