450

[RAprogramm]

Closes #450

Wires DisplayMode into Display for Error — error output now adapts to the deployment environment, as the README originally promised.

Behavior

Mode	Selected by	Output
Prod	MASTERROR_ENV=prod / k8s / release build	compact JSON, no ANSI
Staging	MASTERROR_ENV=staging	JSON + source_chain, no ANSI
Local	MASTERROR_ENV=local / debug build	multi-line report; colored styles this layout only

Mode is detected once per process and cached; MASTERROR_ENV=local is the escape hatch for in-cluster CLI tools; without std the mode falls back to build profile.

Redaction fixes (security-relevant)

• Prod/Staging JSON previously printed Hash and Last4 fields raw — now sha256 hex / masked (field omitted when masking yields nothing)
• Redact fields render as a [REDACTED] placeholder (consistent with ProblemJson) instead of being silently omitted
• Local layout now honors field redaction and MessageEditPolicy::Redact (previously printed everything raw)
• Sanitizers extracted into a shared pub(crate) redaction module used by both Display and ProblemJson — one source of truth

Breaking (0.x behavior change, targeted at 0.29.0)

Default (non-colored) Display output changes from a one-line kind label to the mode-appropriate layout. The stable short form remains error.kind's Display. Log-parsing consumers should pin MASTERROR_ENV.

Tests

Per-mode dispatch tests via a test-only RAII mode override (no env mutation in-process; a dedicated single-test integration binary exercises the real MASTERROR_ENV path), full redaction matrix per layout, strengthened caching test. Rebased over #451's StoredSource storage and re-verified: 1451+ tests, doctests, no_std build, clippy zero warnings, nightly fmt, readme_sync — all green.

[codecov]

Codecov Report

❌ Patch coverage is 98.75931% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/app_error/redaction.rs	97.83%	4 Missing ⚠️
src/app_error/core/display.rs	99.52%	1 Missing ⚠️

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