docs(memory): document holographic memory and local installs

[ScriptedAlchemy]

Summary

• Update README, security notes, user guide, test queries, and comparison docs for holographic memory and local installs.
• Document project-local Cursor transcript search storage in .tokensave/sessions.db.
• Keep docs/config examples aligned with the stacked implementation.

Test plan

• cargo fmt --check
• cargo test --test agent_test test_local_install_cursor_writes_project_config_only
• cargo test --test agent_test test_codex_local_install_writes_hooks
• cargo test --test mcp_handler_test message_search_reads_project_local_session_db
• cargo test --test cursor_transcript_ingest_test
• cargo test --test memory_test
• cargo test --test migration_test
• cargo check

Stacked on #11.

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Latest commit: 27816b2

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[chatgpt-codex-connector]

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