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b3b3feff6f
Eliminate P3-33 / P3-34. Wraps every per-block compression in
the live-zone dispatcher with two new gates:
1. Per-content-type byte thresholds — pinned as `const` at the top
of `live_zone.rs` so the table is grep-able and reviewable in
one place. No magic numbers anywhere in the dispatch logic; a
`threshold_for(ContentType)` helper returns the value. Below
threshold → no compressor invoked, recorded as
`BlockAction::BelowByteThreshold { content_type, byte_count,
threshold_bytes }`. Thresholds:
- JSON-array tool_results: 1 KiB
- Build / log output: 512 B
- Search-result blocks: 1 KiB
- Git-diff blocks: 1 KiB
- Source code: 2 KiB (pinned for the future
Rust code-compressor port)
- Plain text: 5 KiB (pinned for Kompress wiring)
- HTML: 5 KiB (no compressor today)
2. Tokenizer-validated rejection — the byte-length proxy
(`compressed_bytes >= original_bytes`) is replaced with a
token-count check using `headroom_core::tokenizer::get_tokenizer`.
The dispatcher creates one tokenizer per request (model-aware
via the new `model: &str` parameter to
`compress_anthropic_live_zone`) and counts both the original
and compressed text. When `compressed_tokens >= original_tokens`
the candidate is rejected and the original bytes are kept.
`BlockAction::Compressed` and `BlockAction::RejectedNotSmaller`
gain `original_tokens` and `compressed_tokens` fields so the
proxy can log token-savings (the currency that actually matters
for prompt cache + provider billing) instead of bytes.
The proxy `live_zone_anthropic.rs` extracts `body["model"]` (or
falls back to `DEFAULT_MODEL = "claude-3-5-sonnet-20241022"` when
the field is missing — the chars-per-token estimator is calibrated
for the Claude family at 3.5 cpt) and threads it through. The
`Compressed` outcome now reports token counts from the manifest,
not byte counts, so the existing
`tokens_before / tokens_after` plumbing is suddenly accurate.
Tests added:
- `live_zone_thresholds.rs::below_threshold_no_compression_attempted`
— 200 B JSON array → `BelowByteThreshold` and `NoChange`.
- `live_zone_thresholds.rs::above_threshold_compression_attempted`
— 10 KB JSON array → byte-threshold gate clears and a compressor
runs (either `Compressed` or `RejectedNotSmaller`).
- `live_zone_token_validation.rs::compressed_more_tokens_falls_back`
— pathological input must not produce `Compressed` with
`compressed_tokens >= original_tokens`.
- `live_zone_token_validation.rs::compressed_fewer_tokens_accepted`
— well-formed JSON array of dicts → `Compressed` with strict
token shrinkage.
- Property test `live_zone_compression_token_count_non_increasing`
— for any well-formed body generated by `proptest`, the
dispatcher's emitted body has token-count <= input's token-count.
Pins the central PR-B4 invariant: the dispatcher never inflates
tokens.
Existing 12 unit tests in `live_zone.rs` and 6 integration tests
in `tests/live_zone_dispatch.rs` updated for the new field shape
and the `model` parameter; all pass. The diff-routing test's
fixture grew to 1.3 KiB so it clears the new GitDiff threshold
gate, exercising the dispatch path rather than short-circuiting.
Per-PR-B4 plan: REALIGNMENT/04-phase-B-live-zone.md.
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