# Session handoff — 2026-06-22 (76)

Continues from handoff-75 (D3 package managers). This session took up the
**regression-hardening** trio identified as "what's next" now that public
binaries ship: **TT4** (Tier-4 PTY tests), **NFR verification**, and a
**CHANGELOG** — plus a real palette accessibility fix the work uncovered.

## §1. State

**Branch `main`.** Three commits this session:
- `65eab71` `fix(theme)` — WCAG-AA palette fix + contrast/ΔE2000 gates +
  `scripts/palette-preview.py`.
- `fd63de3` `test(tt4)` — Tier-4 PTY end-to-end suite (`tests/e2e_pty.rs`).
- **(pending)** a docs commit — ADR-0008 Amendment 1, ADR-0057, README index,
  `requirements.md`, `CHANGELOG.md`, this handoff, and the plan doc
  `docs/plans/20260622-tt4-nfr-changelog.md`. *(Propose + confirm before
  committing; not yet committed at time of writing.)*

**Test baseline: 2519 passed / 0 failed / 1 ignored** (was 2509; +4 theme
gates, +6 e2e_pty). `clippy --all-targets -D warnings` + `fmt --check` clean.
Full suite verified green 3× under parallel load.

## §2. What shipped

**Palette accessibility (ADR-0057, commit `65eab71`).** Computing real WCAG
ratios while writing the gate **found two shipped defects** in v0.2.0's light
theme — `tok_string` (4.42:1) and `tok_flag` (3.15:1), below the 4.5:1 the
scheme promises — and two dark token pairs that were perceptually close
despite distinct hex. All four fixed (only `theme.rs` colours changed, 4
values). New gated tests in `src/theme.rs`:
- `all_text_colours_meet_wcag_aa_contrast` (≥4.5:1, both themes),
- `advanced_mode_border_meets_ui_contrast` (≥3:1; plain border exempt),
- `delta_e_2000_matches_reference_vectors` (CIEDE2000 validated vs Sharma data),
- `syntax_token_colours_are_perceptually_distinct` (ΔE2000 ≥15).
Dev tool **`scripts/palette-preview.py`** renders the live palette (truecolor
swatch + contrast + ΔE2000), supports `theme:key=HEX` overrides for previewing
changes.

**TT4 — Tier-4 PTY tests (ADR-0008 Amendment 1, commit `fd63de3`).**
`tests/e2e_pty.rs` drives the **real built binary** in a pseudo-terminal:
`portable-pty` 0.9 + `vt100` 0.16 (**`expectrl` dropped** — conflicting PTY
layer; replaced by a hand-rolled `wait_for` on the vt100 grid). 100×30, temp
`--data-dir`, serial, tight 3 s fail-fast waits. The four ADR-0008 flows all
green. Runs by default in `cargo test` → the Linux gate now exercises Tier 4
(**advances TT5**). PTY-in-container validated (openpty+spawn under Docker).
- **Gotchas baked into the harness:** read table presence from the Tables
  **sidebar** region (the Output panel echoes commands, polluting whole-screen
  matches); **pace commands to completion** (a command sent mid-rebuild
  misparses — issue #39); simple-mode insert needs the `values` keyword and a
  single-value insert needs `add column` (a 2nd col in `with pk …` makes a
  **compound PK**).

**NFR verification (ADR-0057).** All seven NFRs formally verified:
- NFR-1/3 **measured** via the PTY harness — release figures **~29 ms** startup
  / **~10 MB** idle RSS (well under 500 ms / 50 MB). Harness tests gate generous
  *debug*-binary bounds for gross-regression detection (tight gates declined as
  flaky — user decision).
- NFR-5/7 **gated** (the contrast/ΔE2000 tests above).
- NFR-2 by architecture (worker thread ADR-0010 + separate input task).
- NFR-4/6 reviewer note (`[/]`).

**CHANGELOG.md** — Keep a Changelog + SemVer; `[Unreleased]` + `[0.2.0]`
(0.1.0 = pre-history). v0.2.0 tag = `bd5be5e`; the palette fix + package
managers + TT4 are post-tag → Unreleased.

## §3. Decisions taken with the user

- Palette: fix the two light contrast bugs **and** the two dark near-duplicates
  (4 hex changes, approved after a rendered preview).
- Borders <3:1 → **accept + document** (decorative chrome).
- Work directly on `main`; ADR-0057 numbered now (not draft).
- NFR perf: measured + generously bounded, **not** tightly CI-gated.
- CHANGELOG depth: 0.2.0 + Unreleased only.
- Schema-cache finding → **file a Gitea issue, defer the fix** (see §4).

## §4. Open / follow-ups

- **Issue #39** (filed this session): simple-mode **Form-B insert**
  (`insert into T values (…)`) submitted faster than the post-DDL **schema-cache
  refresh** validates against stale schema and is misparsed as SQL. No
  interactive-user impact (cast driver + tests pace); deferred fix. Repro +
  diagnosis in the issue.
- **TT5 remaining:** only a **Windows execution runner** now (macOS + Tier-4
  gaps closed this session). First real CI run is the final confirmation that
  the PTY tests pass in the Gitea container (validated locally; very low risk).
- Untouched larger items from the "what's next" survey: hint/help issues
  **#36/#37/#38**; the big features (V4 session journal, TU1 tutorial). The
  CHANGELOG can later feed `--release-notes-url` into the CI winget job
  (handoff-75 §6).

## §5. Process pins

- Commits user-confirmed, no AI attribution, append-only, **push is the user's
  step**.
- `/runda` + DA pass was run on both the plan and the implementation (it caught
  the two light-theme contrast bugs and the #39 schema-cache behaviour — both
  before finalizing).
- Consider a `cargo sweep` at this milestone (release build added ~ a GB).