[codex] Add date filters to recall search

[ScriptedAlchemy]

Summary

• add shared parsing for Unix timestamps, RFC3339, YYYY-MM-DD, today/yesterday, and relative filters like last hour
• wire since/until and time_from/time_to through message_search, sessions search, and lcm_grep
• advertise the filters in MCP and Hermes plugin schemas

Validation

• git diff --check
• cargo check -q -p tracedecay
• cargo test -q -p tracedecay --test session_suite search_session_messages_filters_by_message_timestamp
• cargo test -q -p tracedecay --test mcp_suite lcm_grep_accepts_relative_time_filters
• cargo test -q -p tracedecay --test mcp_suite message_search_filters_by_time_aliases
• cargo test -q -p tracedecay parse_tests::parses_sessions_ingest_and_search_commands

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Latest commit: 078b1a6

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