docs(tt4,nfr): record Tier-4 + NFR verification (ADR-0008 A1, ADR-0057)

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Document the regression-hardening work from this session:

- ADR-0008 Amendment 1 — Tier 4 realized: the portable-pty + vt100 harness,
  expectrl dropped, serial/fail-fast design, the four flows, sidebar-region
  reads, command pacing (issue #39), CI default-target (advances TT5).
- ADR-0057 (new) — NFR verification strategy: contrast + ΔE2000 gates
  (NFR-5/7), startup/RSS measured (NFR-1/3: release ~29 ms / ~10 MB),
  NFR-2 by architecture, NFR-4/6 reviewer note. Records the two shipped
  light-theme contrast defects this work caught and fixed.
- requirements.md: TT4 [~]->[x], TT5 [/] (only a Windows exec runner left),
  NFR-1/2/3/5/7 ->[x], NFR-4/6 ->[/], each with evidence.
- CHANGELOG.md (new): Keep a Changelog + SemVer, [Unreleased] + [0.2.0].
- README ADR index updated; handoff-76; the working plan.

Docs-only (CI gate skips via paths-ignore).

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claude@clouddev1

2026-06-22 13:15:45 +00:00

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