feat: add CHAINLOOP_AI_CODING_SESSION material type

[jiparis]

Summary

• Add new CHAINLOOP_AI_CODING_SESSION material type (enum value 29) for capturing AI coding session telemetry
• Includes JSON schema validation for session data (agent info, session timing, code changes, token usage, model info, raw conversation data)
• Surfaces agent name and primary model as material annotations
• Follows the same chainloop custom type wrapper pattern ({"chainloop.material.evidence.id": "...", "data": {...}}) used by CHAINLOOP_AI_AGENT_CONFIG

✗ cldev att add --kind CHAINLOOP_AI_CODING_SESSION --value /Users/jiparis/Downloads/chainloop-trace-3764001225\ \(2\).json
...
INF uploading chainloop-trace-3764001225 (2).json - sha256:474c5b7868c64b310a4f587a3a0025db7111c3cfe461721a8abfe17de5497b8e
...
INF material added to attestation
...
┌─────────────┬─────────────────────────────────────────────────────────────────────────┐
│ Name        │ material-1774468048181707000                                            │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Type        │ CHAINLOOP_AI_CODING_SESSION                                             │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Required    │ No                                                                      │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Value       │ chainloop-trace-3764001225 (2).json                                     │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Digest      │ sha256:474c5b7868c64b310a4f587a3a0025db7111c3cfe461721a8abfe17de5497b8e │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Annotations │ ------                                                                  │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│             │ chainloop.material.aiagent.name: claude-code                            │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│             │ chainloop.material.aiagent.model: claude-opus-4-6                       │
├─────────────┼─────────────────────────────────────────────────────────────────────────┤
│             │ chainloop.material.size: 11265                                          │
└─────────────┴─────────────────────────────────────────────────────────────────────────┘

Test plan

• Constructor tests (correct type, wrong type)
• Schema validation tests (valid full, valid minimal, missing required fields, missing session, missing agent name)
• Invalid JSON, invalid schema, file not found tests
• Extra fields rejection test
• Annotation extraction tests (with model, without model)
• Full materials test suite passes with no regressions

[cubic-dev-ai]

1 issue found across 24 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="internal/schemavalidators/internal_schemas/aicodingsession/ai-coding-session-0.1.schema.json">

<violation number="1" location="internal/schemavalidators/internal_schemas/aicodingsession/ai-coding-session-0.1.schema.json:54">
P2: `session.ended_at` allows empty strings, so invalid timestamp values can pass validation.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}