Raise measured main workflow coverage to 100%

[rmcdaniel]

Current measurement

The complete main production source inventory at 0f033b2ffe81b9395f704312cc8de506823a0473 reports (full build):

• 54,053 covered executable lines
• 61,618 total executable lines across 528 files
• 87.72% measured line coverage
• 7,565 uncovered executable lines
• no excluded production paths

The generated artifact and non-decreasing coverage ratchet were established in #444. The stable 1.x resolver and bounded-wait work previously consolidated here is complete and shipped in 1.0.82.

Required outcome

• Add behavior-focused tests for uncovered main paths until measured line coverage reaches 100%.
• Keep the accepted baseline non-decreasing on ordinary main changes.
• Keep the measured production source inventory stable while raising coverage.
• Do not reach the target through source exclusions, ignored lines, copied data from another branch, or weakened coverage checks.
• Keep public CI green for every incremental landing.

Completed increments

• Cover persisted payload decode diagnostics #448 covered WorkflowPayloadDecoder.

• Cover durable workflow query argument contracts #457 and Complete durable workflow query contract coverage #458 completed WorkflowQueryContract.

• Recognize main in coverage contracts #459 aligned the coverage contract with the renamed main branch.

• Cover workflow definition contracts #460 covered workflow definition discovery, aliases, portable command contracts, duplicate names, injected parameters, and inherited/trait fingerprints.

• Cover payload envelope resolution contracts #461 covered payload-envelope encoding, inline/external resolution, and validation.

• Cover portable failure restoration contracts #462 through Cover workflow exception contracts #464 covered durable failure restoration, identity, diagnostics, backend fallbacks, timer-limit metadata, and cancellation identity.

• test: cover WorkflowStub fake contracts #465 and Cover reserved WorkflowStub contracts #466 covered fake lifecycle behavior plus reserved-handle and strict workflow-control behavior.

• test: cover local activity command validation #467 covered contradictory local-activity terminal reports and bounded attempt, retry, and heartbeat metadata.

• Cover workflow command validation failures #468 covered malformed child-workflow, service-operation, failure, and update command validation. WorkflowCommandNormalizer now has 186 uncovered executable lines, down from 306 before test: cover local activity command validation #467.

• Cover bundle structure integrity failures #469 covered bundle structure, schema, section-shape, identity, and portable-memo integrity failures.

• Harden offline bundle integrity diagnostics #470 hardened malformed bundle-row handling, converted invalid UTF-8 into a structured integrity finding, and covered payload, Avro schema, history, redaction, checksum, and signature diagnostics. BundleIntegrityVerifier now has 3 uncovered executable lines, down from 223 before Cover bundle structure integrity failures #469.

• Cover replay verification command paths #471 covered replay-verification command output and failure paths.

• Cover workflow scheduling option contracts #472 covered immutable workflow/activity scheduling options plus business-key, label, memo, and search-attribute validation; StartOptions and ActivityOptions now have no uncovered executable paths.

• Cover invocable activity carrier failures #476 covered null argument payloads plus typed-argument, malformed-deadline, and result-encoding failures in the invocable activity carrier. InvocableActivityHandler now has no uncovered executable paths.

• Cover portable signal contract validation #477 covered signal-name and portable parameter normalization plus every invalid signal-declaration boundary. Signal now has no uncovered executable paths.

• Cover portable workflow metadata contracts #478 covered portable search-attribute and memo command validation, typed filtering, replay identity, malformed memo envelopes, and full-length text persistence.

• Cover typed search attribute contracts #479 covered typed search-attribute value coercion, persisted aggregate limits and atomic rollback, plus visibility parsing and archived terminal filtering.

These increments have added 1,226 covered production lines since the 85.36% measurement without adding exclusions or changing the measured 522-file source inventory.

Completion

Close when the main coverage contract reports 100% against the complete production source inventory.

[rmcdaniel]

Current status: Deferred to a recorded product milestone

This work is intentionally scheduled for the product milestone recorded in the issue. No maintainer action is pending.