chore: add .envrc.local to .gitignore

[jmf-pobox]

Adds .envrc.local to .gitignore to support the new .envrc / .envrc.local split.

Summary

• .envrc is now portable (sources shared identity, sets TMPDIR and AGENT_TEAMS)
• .envrc.local holds machine-specific secrets (API keys, keychain refs)
• .envrc.local must be gitignored

Test plan

• direnv allow loads both files
• git status does not show .envrc.local

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Note

Low Risk
Low risk: only updates .gitignore to exclude a local environment file; no runtime or production code changes.

Overview
Adds .envrc.local to .gitignore so machine-specific direnv settings/secrets aren’t accidentally committed, supporting a split between portable .envrc and local overrides.

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