undefined

**Why it works:**
- Structure FORCES preservation of critical categories
- Each section must be explicitly populated (can't silently drop info)
- Incremental merge (new compressions extend, don't replace)

---

from dataclasses import dataclass, field
from typing import Optional

@dataclass
class AnchoredSummary:
    """Structured summary with forced sections."""

    session_intent: str
    files_modified: dict[str, list[str]] = field(default_factory=dict)
    decisions_made: list[dict] = field(default_factory=list)
    current_state: str = ""
    blockers: list[str] = field(default_factory=list)
    next_steps: list[str] = field(default_factory=list)
    compression_count: int = 0

    def merge(self, new_content: "AnchoredSummary") -> "AnchoredSummary":
        """Incrementally merge new summary into existing."""
        return AnchoredSummary(
            session_intent=new_content.session_intent or self.session_intent,
            files_modified={**self.files_modified, **new_content.files_modified},
            decisions_made=self.decisions_made + new_content.decisions_made,
            current_state=new_content.current_state,
            blockers=new_content.blockers,
            next_steps=new_content.next_steps,
            compression_count=self.compression_count + 1,
        )

    def to_markdown(self) -> str:
        """Render as markdown for context injection."""
        sections = [
            f"## Session Intent\n{self.session_intent}",
            f"## Files Modified\n" + "\n".join(
                f"- `{path}`: {', '.join(changes)}"
                for path, changes in self.files_modified.items()
            ),
            f"## Decisions Made\n" + "\n".join(
                f"- **{d['decision']}**: {d['rationale']}"
                for d in self.decisions_made
            ),
            f"## Current State\n{self.current_state}",
        ]
        if self.blockers:
            sections.append(f"## Blockers\n" + "\n".join(f"- {b}" for b in self.blockers))
        sections.append(f"## Next Steps\n" + "\n".join(
            f"{i+1}. {step}" for i, step in enumerate(self.next_steps)
        ))
        return "\n\n".join(sections)