docs(spec): DOC-32 trusty-headroom — reversible context-compression service#1983
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…ervice Spec for a new standalone Rust workspace crate `trusty-headroom` (a-la trusty-search: lib + bins + src/mcp/), a clean-room reimplementation of Netflix Headroom's ideas: reversible Compress-Cache-Retrieve (CCR), content-type transforms (JSON crush, code AST, log dedup), and an MCP retrieve tool. Key decisions captured: (1) callable service (lib + CLI + on-demand MCP), NO daemon in Phase 1 — the algorithmic transforms have zero model-load latency, so a warm daemon is only justified if an optional ML text-compressor (Phase 2) is added; (2) supersedes trusty-mpm's lossy optimizer.toml (Trim/Summarise/Caveman) with reversible compression; (3) wires into the managed launcher's PostToolUse + retrieve-MCP, closing the "optimizer not wired in managed sessions" gap. Incorporates DOC-32 KV-cache audit finding (trusty-mpm's system-prompt prefix is already cache-stable) and both architecture steers from the design discussion. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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docs/specs/trusty-headroom.md(DOC-32 / SPEC-HEADROOM-01..09).Specs a new standalone Rust crate
trusty-headroom— a clean-room reimplementation of Netflix Headroom (reversible Compress-Cache-Retrieve, JSON/code/log transforms, MCP retrieve tool) as a callable service (lib + CLI + on-demand MCP, no daemon in Phase 1 since the algorithmic transforms have zero model-load latency). Supersedes trusty-mpm's lossyoptimizer.tomland wires reversible compression into the managed launcher's PostToolUse + retrieve-MCP.Doc-only. Tracks #1982.
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