Consolidate blinkagent[bot] and blink-so[bot] into a single identity

[blinkagent]

Problem

Blink-created PRs and commits show two different bot identities:

• blinkagent[bot] - the GitHub App that pushes commits and creates PRs
• blink-so[bot] - set as GIT_AUTHOR_NAME/GIT_COMMITTER_NAME in the CLI, appears in Co-authored-by trailers

This causes confusion as users see both identities attributed to the same commit.

Current Behavior

In packages/blink/src/cli/connect.ts (and compute-server.ts), the CLI sets:

process.env.GIT_AUTHOR_NAME = "blink-so[bot]";
process.env.GIT_AUTHOR_EMAIL = "211532188+blink-so[bot]@users.noreply.github.com";
process.env.GIT_COMMITTER_NAME = "blink-so[bot]";
process.env.GIT_COMMITTER_EMAIL = "211532188+blink-so[bot]@users.noreply.github.com";

When the GitHub App (blinkagent[bot]) pushes these commits, GitHub shows both identities.

Proposal

Consolidate to a single identity for cleaner attribution. Options:

1. Use the same identity (blinkagent[bot] or blink-so[bot]) for both the CLI git config and the GitHub App
2. Remove the Co-authored-by trailer if it's redundant

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Created on behalf of @matifali and @hugodutka