codex: wire startup memory extraction and consolidation

[jif-oai]

Summary

• wire startup memory phase-1 extraction into Session startup flow
• persist phase-1 outputs and schedule per-cwd consolidation subagents
• add phase progress logs and consolidation lock release-on-agent-completion flow
• set consolidation subagent cwd to memory root to align workspace-write permissions
• extract memory startup/consolidation implementation into core/src/codex/memory_startup.rs to keep codex.rs thinner

Testing

• just fmt
• cargo test -p codex-core --lib memories::
• cargo test -p codex-core --lib codex::tests::resumed_history_seeds_initial_context_on_first_turn_only

[jif-oai]

@codex review

[chatgpt-codex-connector]

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