📝 Add docstrings to feature/reading-artifact-hardening

[coderabbitai]

Docstrings generation was requested by @flyingrobots.

• [codex] Harden reading artifact posture #319 (comment)

The following files were modified:

• crates/warp-core/src/observation.rs

These files were kept as they were

• crates/echo-wasm-abi/src/lib.rs
• crates/warp-wasm/src/warp_kernel.rs

These file types are not supported

• docs/BEARING.md
• docs/spec/SPEC-0004-worldlines-playback-truthbus.md
• docs/spec/SPEC-0009-wasm-abi.md

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[flyingrobots]

Closing as superseded/outdated after #319 and current main.

Triage evidence:

• PR 📝 Add docstrings to feature/reading-artifact-hardening #320 only changes crates/warp-core/src/observation.rs with generated docstrings for ReadingResidualPosture::to_abi.
• The proposed example is stale: it references ReadingResidualPosture::Plurality, but current main uses ReadingResidualPosture::PluralityPreserved and maps to abi::ReadingResidualPosture::PluralityPreserved.
• The target method is private implementation glue, so the generated example is not useful enough to rescue as a standalone docs commit.
• Current main already contains the substantive reading posture work and the [codex] Harden reading artifact posture #319 test hardening.

No code from this PR is being merged.