feat(cost): tagged Bedrock application inference profiles

[krokoko]

Context: ROADMAP.md → Optional tagged application inference profiles
Related: #215

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Component

CDK / infrastructure

Describe the feature

CDK-managed Bedrock application inference profiles per onboarded repo or environment. Set ANTHROPIC_MODEL to tagged profile ARN for resourceTags/* billing when repo count is bounded.

Use case

When IAM session-tag attribution (#215) is insufficient or repo count is small, tagged inference profiles provide an alternative chargeback dimension in CUR.

Proposed solution

1. Blueprint optional inference_profile_arn override.
2. CDK creates profiles with resourceTags for repo, environment.
3. Agent/runtime config resolves model ARN at task start.
4. Document operator setup and profile limits in docs/design/COST_MODEL.md.
5. Fallback to default model when profile unset.

Other information

• Complements feat: Bedrock cost attribution — session tags, request metadata, and operator FinOps guidance #215; not a replacement for in-app cost_usd.

• Design context: docs/design/COST_MODEL.md.

• This might be a breaking change