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parity: session_log probe + Rust observability parity recorded

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Companion to lakehouse commit 57bde63 (Rust gateway gains
trace-id propagation + coordinator session JSONL). The
cross-runtime parity probe is the regression gate that prevents
silent schema drift between the two runtimes.

scripts/cutover/parity/session_log_parity.sh:
  - 4 fixtures (accepted_grounded, max_iter_exhausted, infra_error,
    unicode_in_prompt) feed identical input to both helpers
  - jq -e validity gate + non-trivial-equal guard prevents the
    "both sides fail identically → spurious match" failure mode
    (caught one IFS='||' bug during initial authoring — recorded
    in the script comment)
  - normalize() strips timestamp + daemon (legitimate per-producer
    differences); everything else must be byte-equal
  - Result: 4/4 fixtures match, including unicode

scripts/cutover/parity/session_log_helper/main.go:
  - Tiny stdin/stdout Go helper that round-trips a fixture
    through validator.SessionRecord serde
  - Counterpart to crates/gateway/src/bin/parity_session_log.rs

docs/ARCHITECTURE_COMPARISON.md decisions tracker:
  - "Rust observability parity" row added (DONE 2026-05-02)
  - Cross-runtime probe documented as reusable gate

STATE_OF_PLAY refreshed.

Both observability pieces (trace-id propagation, session JSONL)
now exist on both runtimes. Operators who point Rust gateway and
Go validatord at the same session-log path get a unified
longitudinal stream queryable via DuckDB.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
root
2026-05-02 05:39:49 -05:00
co-authored by Claude Opus 4.7
parent 1a3a82aedb
commit fa4e1b4e16
5 changed files with 213 additions and 1 deletions
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STATE_OF_PLAY.md
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# STATE OF PLAY — Lakehouse-Go
**Last verified:** 2026-05-02 ~08:00 CDT
**Last verified:** 2026-05-02 ~10:30 CDT
**Verified by:** **production-readiness gauntlet** — 21/21 smoke chain green, per-component scrum across 4 bundles, **3 cross-runtime parity probes all green post-fix** (validator: **6/6 match** after wire-format alignment shipped; materializer: 2/2 after omitempty fix; extract_json: 12/12). All findings surfaced by the parity probes have been actioned. Disposition: `reports/cutover/gauntlet_2026-05-02/disposition.md`.
> **Read this FIRST.** When the user says "we're working on lakehouse," default to the Go rewrite (this repo); the Rust legacy at `/home/profit/lakehouse/` is maintenance-only. If memory contradicts this file, this file wins. Update it when something is verified working — not when a phase finishes.