feat(aws/ec2): add instance type recommender

[rwaterman]

Summary

aws/ec2/recommend_instance_types.sh — prompts for architecture (x86 or arm/Graviton), memory in GiB, and vCPU count (or takes them as positional args), then prints the five cheapest current-generation instance types matching those specs. Prices are on-demand Linux, shared tenancy, in the active region (AWS_REGION or aws configure get region).

Specs come from ec2 describe-instance-types; prices from the Pricing API via us-east-1. Requires jq (Homebrew).

Usage

./aws/ec2/recommend_instance_types.sh            # prompts for everything
./aws/ec2/recommend_instance_types.sh arm 8 4    # no prompts

Example (arm 8 4, us-west-2):

TYPE         USD/HR  USD/MONTH  NETWORK             BURSTABLE  LOCAL_DISK  PROCESSOR
c6g.xlarge   0.136   99.28      Up to 10 Gigabit    false      false       AWS Graviton2 Processor
c7g.xlarge   0.145   105.85     Up to 12.5 Gigabit  false      false       AWS Graviton3 Processor
c6gd.xlarge  0.1536  112.13     Up to 10 Gigabit    false      true        AWS Graviton2 Processor
c8g.xlarge   0.1595  116.45     Up to 12.5 Gigabit  false      false       AWS Graviton4 Processor
c7gd.xlarge  0.1814  132.42     Up to 12.5 Gigabit  false      true        AWS Graviton3 Processor

Verified

Ran locally against us-west-2: arm and x86 with args, prompted via stdin, empty prompts (defaults x86/8/4), no-match (arm 7 4) and invalid inputs exit 1 with a message.

🤖 Generated with Claude Code

https://claude.ai/code/session_01LDy1zbMiZbgvzDwH8BkagL