fix: scope airdrop tier to RustChain-specific PRs, not GitHub-wide (fixes #8184) [fj4WqyCCw3C5ShR1RfB7MoBPTpkRrBFYP1uT35g3MvT]

[waterWang]

Fix #8184: airdrop _determine_tier counts GitHub-wide activity

Problem

_determine_tier() in node/airdrop_v2.py queries GitHub's commit search API with:

q: author:{github_username} merged:true

This counts all merged PRs across all of GitHub — any established GitHub account reaches the CORE tier (200 wRTC) without ever contributing to RustChain.

Fix

Add repo:Scottcjn/Rustchain to the search query so only PRs merged into the RustChain repository are counted:

q: author:{github_username} repo:Scottcjn/Rustchain merged:true

Changes

• 1 file changed: node/airdrop_v2.py (line 651)
• 3 insertions, 3 deletions (whitespace normalization)

Testing

• ✅ Python syntax check passed
• ✅ Python compile check passed

[Scottcjn]

Holding this alongside #8190. This branch is stacked on it, so it carries the /p2p/gossip auth change as well as its own, and that change would break inter-node gossip as written. Details are in the review on #8190.

Nothing here is rejected. Once #8190 is revised, or once this is rebranched off current main so it carries only its own diff, I will review it on its own merits. main has moved a long way today, so a fresh branch is probably less work than untangling the stack.