7ef21239ca
Providers stream token-sized deltas, so a session log stores hundreds of near-identical assistant/chunk lines whose JSON envelopes dwarf their payloads (~56x measured on a real DeepSeek session, 73% of file bytes). Add a lossless storage codec to dsh-session: packChunkRuns() folds each run of >=3 consecutive same-block delta chunks into one storage row -- text-chunks / reasoning-chunks / tool-call-chunks, bare slash-less tags like the header line's 'session' so rows cannot be confused with session events -- and decodeStorageRecord() expands rows back to the exact original events (seq0/time0 + dt gap array reconstruct every member's seq/time; tool-call rows carry the run-constant id/name). The encoder whitelists exact shapes and stores anything unrecognized verbatim; the decoder validates row-tagged values and fails loud on malformation. The JSONL backend gains a packChunks config (default false). Writing packs only when enabled -- default-off output stays byte-identical to the previous layout, so snapshot goldens are untouched. Reading is layout-blind: scanLog always decodes rows and now checks seq contiguity with a cursor instead of the line index, so packed, unpacked, and mixed files all load identically. Fixture readers (llm-replay parseSessionLog, acp-snapshot normalizeSessionLog) share the codec; the normalizer zeroes a row's time0/dt exactly like an event's time. The two demo bundles plumb packChunks from cordis.yml to the backend. Measured on a real coding session: 105 KB -> 42 KB (-60%), 475 lines -> 74, with reasoning/tool-call heavy sessions saving the most. Covered by example + fast-check round-trip codec tests, backend packed/mixed/torn- tail specs, and an end-to-end demo run loading a packed log through a default-config backend.
support/ — dev/test/example infrastructure
Packages that exist to serve development, testing, and the examples rather than to ship as product API. They are real workspace packages (typed, tested, under the coverage gate), but they carry lower compatibility expectations: they may change or be removed when the development need behind them does, without the deprecation care a product package would warrant.
| Package | Role | ctx key |
|---|---|---|
acp-snapshot/ |
ACP snapshot suite kit: subprocess scenario harness + golden normalizers + the defineAcpSnapshotSuite factory |
(library — imported by example *.snapshot.ts suites) |
invariants/ |
Runtime event-contract assertions for development diagnostics | (listens on session/*, agent/*) |
loader-smoke/ |
Shared real-Loader subprocess harness for keyless example smokes | (library — imported by example e2e suites) |
llm-replay/ |
Record/replay adapter: short-circuits llm/stream from a recorded session JSONL (keyless snapshot tests) |
(listens on llm/stream) |
subagent-mock/ |
Scripted SubagentProvider for deterministic seam/tool tests |
(registers on ctx.subagents) |
invariants is development support but has no environment guard: it runs wherever registered, and the default dsh-agent-spine-demo bundle mounts it unconditionally. llm-replay backs the demos and the snapshot test tier under the per-file coverage gate. acp-snapshot carries the snapshot tier's harness/normalizer/suite machinery, while loader-smoke owns the parallel stdio/Loader process boundary used by keyless example e2e suites. subagent-mock exercises the real ctx.subagents load path without a model or child agent. A package graduates OUT of support/ into a product group only when it gains documented product consumers.