feat: add rtk cdk diff/synth/deploy filters

[ThomasHoussin]

Context

AWS CDK is an Infrastructure-as-Code framework. Its CLI commands (cdk diff, cdk synth, cdk deploy) produce extremely verbose output: asset bundling logs (esbuild, Docker, pip), CloudFormation progress lines, NOTICES sections, and full YAML templates. A typical cdk diff on a project with 13 lambdas generates ~870 tokens of which only ~240 are meaningful.

What this PR does

Adds rtk cdk with 3 specialized filters:

• rtk cdk diff — Keeps only stack headers, resource diff markers ([+]/[-]/[~]), IAM change tables, and a summary count. Strips all bundling noise, build logs, and NOTICES.
• rtk cdk synth — Two modes: when no stack is specified, shows the synthesized path + stack list. When a full YAML template is output, extracts a resource type summary (e.g. "Lambda::Function x7, IAM::Role x10").
• rtk cdk deploy — Strips per-resource CloudFormation progress lines, keeps success/failure status, outputs section, and timing. Handles both standard and stack-prefixed progress formats.

Design: whitelist approach — only keep lines matching known meaningful patterns. Everything else is dropped. This is future-proof: any new bundler or tool CDK adds will be automatically filtered without code changes.

Handles Windows/PowerShell mojibake (box-drawing characters rendered as Ôö£ÔöÇ instead of ├──).

Token savings

Fixture	Raw	Filtered	Savings
cdk diff (5 stacks, esbuild bundling)	870 tok	240 tok	72.4%
cdk diff (Docker pull + pip install)	1049 tok	133 tok	87.3%
cdk synth (no-template, stack list)	483 tok	10 tok	97.9%
cdk synth (full 62KB YAML template)	2446 tok	23 tok	99.1%
cdk deploy (stack-prefixed progress)	396 tok	13 tok	96.7%

Depends on

Based on #398 (fix/windows-cmd-compat) — cdk_cmd.rs uses script_cmd() required for Windows where cdk is a .ps1 wrapper. Will rebase onto master once #398 is merged.

Test plan

• 32 unit tests including 6 insta snapshot tests
• 6 real-world anonymized fixtures (2 projects x 3 commands)
• Token savings verified >= 60% on all fixtures
• cargo fmt && cargo clippy --all-targets && cargo test --all — 745 tests pass

🤖 Generated with Claude Code

[CLAassistant]

All committers have signed the CLA.

[aeppling]

Hey

We are cleaning up the codebase and improving the project structure for better onboarding. As part of this effort, PR #826 reorganizes src/ from a flat layout into subfolders.

No logic changes — only file moves and import path updates.

What you need to do

Rebase your branch on develop when receiving this comment:

git fetch origin && git rebase origin/develop

Git detects renames automatically. If you get import conflicts, update the paths:

use crate::git;        // now: use crate::cmds::git::git;
use crate::tracking;   // now: use crate::core::tracking;
use crate::config;     // now: use crate::core::config;
use crate::init;       // now: use crate::hooks::init;
use crate::gain;       // now: use crate::analytics::gain;

Need help rebasing? Tag @aeppling

[ThomasHoussin]

Rebased onto develop (post PR #826 folder reorganization)

What changed vs the original commit:

File moves:

• src/cdk_cmd.rs → src/cmds/cloud/cdk_cmd.rs
• src/snapshots/rtk__cdk_cmd__* → src/cmds/cloud/snapshots/rtk__cmds__cloud__cdk_cmd__*

Import adaptations (mechanical):

• crate::utils::{script_cmd, strip_ansi, truncate} → crate::core::utils::{resolved_command, strip_ansi, tool_exists, truncate}
• crate::tracking → crate::core::tracking
• crate::tee:: → crate::core::tee::
• crate::utils::has_program("cdk") → tool_exists("cdk")
• include_str! paths updated from ../tests/ to ../../../tests/ (3 levels up)

Review fixes (new improvements):

• W1: Added #[command(alias = "synthesize")] on CdkCommands::Synth — rtk cdk synthesize now correctly routes to the synth filter instead of passthrough
• W2: Added subcmd_status for destroy and bootstrap as RtkStatus::Passthrough in discover rules — rtk discover no longer claims 75% savings for unfiltered subcommands

Dependency change:

• insta = "1" added to [dev-dependencies] for snapshot testing (first usage in the project)

Token savings verified on all 6 fixtures:

Fixture	Input	Output	Savings
cdk_diff_raw	870	240	72%
cdk_diff_raw_1	1049	133	87%
cdk_synth_raw	483	10	98%
cdk_synth_raw_1	2374	23	99%
cdk_deploy_raw	334	20	94%
cdk_deploy_raw_1	396	13	97%

Test results: 32 unit tests (6 snapshot). 1173 total tests passing (0 failures).

All filter logic, whitelist approach, and mojibake handling are unchanged from the original PR.

[rtk-release-bot]

This pull request has been automatically marked as stale due to 90 days of inactivity. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. Your contribution is very much appreciated — we're sorry we haven't been able to review it yet.

[rtk-release-bot]

Closing this pull request after a prolonged period of inactivity. If this is still relevant, please ask for it to be reopened. Thank you!