feat: add /compact command, session size monitoring, and resume fallback

fix: force dotenv override to prevent PM2 env variable pollution

docs: add feishu-codex implementation plan

docs: add feishu-codex design spec

docs: clarify bypassPermissions is an architectural constraint, not a preference

chore: reduce MAX_TOOL_LINES to 5 and add security warning to README

feat: two-phase card truncation — fold tool lines + byte limit

feat: truncate card content from head to prevent 30KB overflow

docs: add card.action.trigger callback to Feishu setup guide

docs: polish README — sync features, fix structure, improve presentation

style: each tool gets its own decorated separator line

style: always use multi-line format for tool separators

style: wrap long tool separator lines for readability

feat: accumulate multi-turn text with tool separators in streaming cards

docs: restore localization comments and add multimodal optimization plan