feat(config): support OPENCODE_SPAN_ATTRIBUTES

[dialupdisaster]

Summary

• add OPENCODE_SPAN_ATTRIBUTES to plugin config and parse custom attribute pairs once
• attach those attributes to the shared commonAttrs path so they flow to every span, log event, and metric data point
• document the new env var and add regression coverage for parsing and propagation

Testing

• bun run typecheck
• bun test

Closes #63

Summary by CodeRabbit

• New Features

  • Added OPENCODE_SPAN_ATTRIBUTES environment variable to attach custom comma-separated key=value pairs to all emitted spans, logs, and metrics for enhanced filtering and grouping.

• Documentation

  • Updated configuration guides to document the new span attributes feature and clarify the distinction between resource-level and span-level metadata.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/index.ts`:
- Around line 110-113: The user-provided span attributes from
parseAttributePairs(config.spanAttributes) are spread after the project.id
property, allowing them to override it. Reorder the properties in the
commonAttrs object so that "project.id": project.id is placed after the spread
operator of parseAttributePairs(config.spanAttributes), ensuring the canonical
project id always takes precedence and cannot be overridden by user-provided
configuration.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 91a0e6c5-4817-4de6-ae2a-6ccbd78abb61

📥 Commits

Reviewing files that changed from the base of the PR and between 7153352 and 5c07830.

📒 Files selected for processing (11)

• AGENTS.md
• README.md
• src/config.ts
• src/index.ts
• src/otel.ts
• src/types.ts
• tests/config.test.ts
• tests/handlers/message.test.ts
• tests/handlers/spans.test.ts
• tests/helpers.ts
• tests/otel.test.ts

[dialupdisaster]

Addressed the project.id precedence issue.

• reordered commonAttrs so user-provided OPENCODE_SPAN_ATTRIBUTES cannot override the canonical project.id
• pushed follow-up commit 109a42f
• re-ran bun run typecheck and bun test

The CodeRabbit thread is resolved.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 998c3c84-49b2-43b0-b0fa-a5cc741341a4

📥 Commits

Reviewing files that changed from the base of the PR and between 5c07830 and 0d02eac.

📒 Files selected for processing (11)

• AGENTS.md
• README.md
• src/config.ts
• src/index.ts
• src/otel.ts
• src/types.ts
• tests/config.test.ts
• tests/handlers/message.test.ts
• tests/handlers/spans.test.ts
• tests/helpers.ts
• tests/otel.test.ts

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• Create PR with unit tests
• Commit unit tests in branch feat/span-attributes

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