Add JSDoc for payload fragment, wire-format, envelope, and link-creator APIs

[baanish]

Motivation

• Improve developer clarity around fragment encoding/decoding expectations and error semantics for the fragment transport (#agent-render=v1...).
• Document sync vs async codec behavior (notably arx requiring async handling) so callers pick the correct API.
• Describe packed-wire transport (p:1) shape and compatibility expectations to make packing/unpacking intent explicit.
• Clarify envelope normalization rules (duplicate ids, diff artifact requirements, and activeArtifactId normalization) and link-creator error/return semantics.

Description

• Added JSDoc to src/lib/payload/fragment.ts for encodeEnvelope, encodeEnvelopeAsync, decodeFragment, and decodeFragmentAsync, documenting fragment format (#agent-render=v1.<codec>.<payload>), structured error responses, decoded/fragment size limits, and sync vs async codec behaviors (including arx handling).
• Added JSDoc to src/lib/payload/wire-format.ts for packEnvelope and unpackEnvelope, describing the compact packed envelope shape (p: 1), when packing is used, and that unpackEnvelope preserves compatibility by returning non-packed inputs unchanged.
• Added JSDoc to src/lib/payload/envelope.ts for normalizeEnvelope, describing duplicate-id validation, diff artifact validation rules (patch or old/new pair), and activeArtifactId normalization behavior.
• Added JSDoc to src/lib/payload/link-creator.ts for createDraftEnvelope, createGeneratedArtifactLink, createGeneratedArtifactLinkAsync, and getBodyFieldLabel, documenting thrown errors, fragment length checks against MAX_FRAGMENT_LENGTH, and the returned GeneratedArtifactLink semantics (hash, url, fragmentLength, envelope, artifact).
• All changes are documentation comments only and do not alter runtime behavior.

Testing

• Ran the test suite with npm run test, which completed successfully: all tests passed (54 tests across 9 files).
• No runtime behavior changes were introduced, and the test suite verifies existing behavior remains unchanged.

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Codex Task

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[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• src/lib/payload/envelope.ts - Added JSDoc documentation to normalizeEnvelope function
• src/lib/payload/fragment.ts - Added JSDoc documentation to 4 functions (encodeEnvelope, encodeEnvelopeAsync, decodeFragment, decodeFragmentAsync)
• src/lib/payload/link-creator.ts - Added JSDoc documentation to 4 functions (createDraftEnvelope, createGeneratedArtifactLink, createGeneratedArtifactLinkAsync, getBodyFieldLabel)
• src/lib/payload/wire-format.ts - Added JSDoc documentation to 2 functions (packEnvelope, unpackEnvelope)

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Analysis: This PR adds JSDoc documentation comments to various payload module functions. All changes are purely documentation additions with no code logic changes. The JSDoc comments are well-written and accurately describe the functions' behavior, parameters, and return values. No security issues, runtime errors, or logic bugs were identified.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

This PR adds JSDoc documentation comments to several functions in the payload handling modules:

File	Functions Documented
src/lib/payload/envelope.ts	normalizeEnvelope
src/lib/payload/fragment.ts	encodeEnvelope, encodeEnvelopeAsync, decodeFragment, decodeFragmentAsync
src/lib/payload/link-creator.ts	createDraftEnvelope, createGeneratedArtifactLink, createGeneratedArtifactLinkAsync, getBodyFieldLabel
src/lib/payload/wire-format.ts	packEnvelope, unpackEnvelope

Assessment

• Code Changes: None - this is a documentation-only PR
• Security: No changes to runtime behavior
• Logic: No modifications to function logic
• Breaking Changes: None

The JSDoc comments are well-written, accurately describe function behavior, and follow standard conventions including proper @link references for cross-referencing functions.

Files Reviewed (4 files)

• src/lib/payload/envelope.ts
• src/lib/payload/fragment.ts
• src/lib/payload/link-creator.ts
• src/lib/payload/wire-format.ts