Robust retry

[cryptosebek]

Adds robust retry handling for agent RPC calls when OpenRouter/provider limits or transient errors occur.

• Added configurable agentRetry workflow settings.
• Retries retryable provider/transport failures with exponential backoff and jitter.
• Honors Retry-After style hints when present.
• Applies retry behavior to PM, developer, and verifier RPC agents.
• Added tests for retry classification, delay calculation, config defaults, and validation.
• Fixed existing lint issue in subagent env typing.

[hlibr]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Isolate per-project env instead of reusing global values

Load logic currently writes each project's .env directly into process.env without override, so a second project in the same Pi process can inherit credentials from the first project (for example OPENROUTER_API_KEY), because existing keys are kept and then forwarded by getSubagentEnv. This can route subagent traffic to the wrong account whenever users switch repositories in one session.

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[cryptosebek]

@hlibr I got rid of redundant env changes, as well as addressed all the codex comments.