* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials for token extraction
Users who configured their token via `hermes setup` have it stored in
~/.hermes/.env (GITHUB_TOKEN=...), not in ~/.git-credentials. On macOS
with osxkeychain as the default git credential helper, ~/.git-credentials
may not exist at all, causing silent 401 failures in all GitHub skills.
Add ~/.hermes/.env as the first fallback in the auth detection block and
the inline "Extracting the Token from Git Credentials" example.
Priority order: env var → ~/.hermes/.env → ~/.git-credentials → none
Part of fix for NousResearch/hermes-agent#3464
* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials
Fixes#3464
* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials
Fixes#3464
* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials
Fixes#3464
* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials
Fixes#3464
* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials
Fixes#3464
* fix(github-auth): check ~/.hermes/.env before ~/.git-credentials
Fixes#3464
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