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Kimi compaction parity

This specification defines the manual compact_conversation and compact_up_to_here session actions owned by the kimi-tools plugin package. It targets parity with kimi-cli's SimpleCompaction for the compaction request shape, system prompt, tool suppression, preserved-tail behavior, summary injection format, prompt body, and enablement enforcement.

It covers:

• the single synthetic user message built from ## Message N blocks, including a selected leading agent system message;
• the generic compactor system prompt used only for the compaction request;
• unconditional tool suppression via disable_all_tools, after configurable request overrides;
• preserved-tail behavior for full-range compaction;
• the <system>…</system>-wrapped summary injection in one user message;
• the exact kimi-cli compaction prompt body;
• agent-level enablement through compaction.enabled and compaction.type;
• the top-level per-session compaction_model override emitted by the configuration UI;
• intentional deviations from kimi-cli (auto-compaction, checkpoint/context rewrite, D-Mail).

It does not redefine general feature-plugin lifecycle, session persistence, native-history rebuilding, or the platform's disable_all_tools tool-gating contract. It applies those package and framework capabilities to Kimi-style compaction.

Specification documents:

• Product specification
• Technical specification
• Requirements and evidence

Approval and execution are tracked by Kimi compaction parity correction task.

The historical research task Kimi compaction and checkpoints is superseded for the manual-compaction portion by this specification and its approval task. The checkpoint/D-Mail portion of the historical task remains open and separate.