dynamodb_cdc: add benchmark tooling

[squiidz]

Add a self-contained benchmark under internal/impl/aws/dynamodb/bench/ that seeds 450k items into DynamoDB Local and measures CDC throughput via the aws_dynamodb_cdc input.

Run with: task run

[claude]

Commits
LGTM

Review
Single-commit PR adds a self-contained DynamoDB CDC benchmark tool under internal/impl/aws/dynamodb/bench/. Includes a data seeder (main.go), Taskfile, benchmark config, and README. This is a standalone benchmark utility, not a component, so component-specific patterns (registration, ConfigSpec, field constants, etc.) don't apply. Error handling, license header, and context usage are all correct.

LGTM

[claude]

Commits
LGTM

Review
Adds standalone benchmark tooling for DynamoDB CDC: a data generation CLI (main.go), Taskfile, benchmark config, and README. License headers, error handling, and context usage are all correct.

LGTM

[claude]

Commits

1. linter fix (bd9b167): Does not match any valid commit message format. Must use a system prefix (e.g., dynamodb_cdc: fix linter issue) or chore: fix linter issue per commit policy. Additionally, this appears to be a fixup of the first commit and should be squashed before merge.

Review
The PR adds a self-contained benchmark tool for DynamoDB CDC under internal/impl/aws/dynamodb/bench/. Code is clean: proper RCL license header, correct error handling, safe concurrency patterns with atomics and channels, and dummy credentials appropriate for DynamoDB Local.

LGTM