fix(resource): expose standard budget error contract

[seonghobae]

Buyer/reliability gap

originweave-resource::BudgetError is a public failure type, but protected main did not implement the standard Rust Display / std::error::Error contract. Resource-governor callers therefore had to special-case validation failures instead of preserving typed context through ordinary Rust integration boundaries.

TDD lineage

This branch starts directly from protected main 0c376acf059be9ddddddfbde1d0189e4f39ef014.

Exact test-only head fe871b17d07a3a08592144384a780775b7b88526 required deterministic credential-free messages for both current BudgetError variants and required Error::source() to remain empty before production support existed. The production remedy adds only exhaustive Display plus source-free std::error::Error.

Current implementation

Exact head d9166d89f154962af7a6b2b7902ff3b2c4579606:

• renders ZeroLimit as a deterministic non-secret operator message;
• renders SoftExceedsHard as a deterministic non-secret operator message;
• implements std::error::Error without fabricating a nested source;
• leaves all resource-budget values, limits, pressure classification, and governor decisions unchanged; and
• records resource-budget failures in the existing standard-error changelog contract.

The exact diff is limited to the resource crate, its focused public integration regression, and the canonical changelog line.

Exact-head verification

On unchanged exact head d9166d89f154962af7a6b2b7902ff3b2c4579606 against exact protected main 0c376acf059be9ddddddfbde1d0189e4f39ef014:

• CI 31823695097: success;
• Rust contracts job 94842723654: repository contracts, formatting, locked workspace/all-target checks, full tests, strict Clippy, and rustdoc success;
• Production coverage job 94842723607: exact owned-production function, line, region, and branch coverage enforcement success;
• SAST Semgrep 31823695066: success;
• Security Scan 31823695031: success;
• no formal review or unresolved inline thread is currently returned; and
• GitHub reports the PR open, Ready, and mergeable.

No predecessor-head, queued, skipped, synthetic, or model-only result is promoted as current proof.

Scope boundary

This changes no resource limits, pressure classification, governor decisions, telemetry, process attribution, persistence, workflow, or release behavior. Passing automation is not independent approval; protected integration remains subject to the live ruleset and unchanged-head review evidence.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0841d2a and 50fa3c3.

📒 Files selected for processing (3)

• CHANGELOG.md
• crates/originweave-resource/src/lib.rs
• crates/originweave-resource/tests/error_contract.rs

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