Track DAG rollout after v1.221.0 release

[Mikhail Shirkov (shirkevich)]

Summary

Refreshes the DAG concurrent execution rollout tracker after PR 7 merged into main and shipped in Atmos v1.221.0.

The tracker now documents:

• PR 1 through PR 7 as merged and available in Atmos v1.221.0: Add process and I/O execution foundation #2464, [codex] add dag scheduler core #2465, [codex] consolidate terraform bulk execution on scheduler #2466, [codex] enable terraform plan scheduler concurrency #2468, PR5: Concurrent Terraform apply and destroy #2474, Route Terraform affected through scheduler #2519, and DAG follow-up: aggregate CI output for concurrent Terraform runs #2577
• PR 8 as the next planned work from current main on codex/dag-terraform-interactive-output
• GitHub Actions CI output findings from PR 7: native --ci provider detection, aggregate writes to $GITHUB_STEP_SUMMARY and $GITHUB_OUTPUT, serialized optional comments/status contexts, and single-component compatibility
• DAG hardening findings from PR 7: identity-backed secret resolution, credential materialization, Terraform/OpenTofu provider cache access, and bounded/truncated CI output handling
• the maintainer note that GitHub step summaries have a practical 1 MiB limit, so bulk operations need bounded summaries plus logs/artifacts for full detail

Current rollout

Step	PR	Status	Branch	Scope
PR 1	#2464	Merged into main	codex/dag-process-io-foundation	Process runner and stream injection foundation
PR 2	#2465	Merged into main	codex/dag-scheduler-core	Generic scheduler core
PR 3	#2466	Merged into main	codex/dag-terraform-graph-bulk-path	Terraform graph-backed bulk routing
PR 4	#2468	Merged into main	codex/dag-terraform-plan-concurrency	Concurrent Terraform plan output/logging/summary support
PR 5	#2474	Merged into main	codex/dag-terraform-apply-destroy-concurrency	Concurrent Terraform apply/destroy safety model
PR 6	#2519	Merged into main	codex/dag-terraform-affected-scheduler	Terraform affected scheduler route and failure modes
PR 7	#2577	Merged into main; released in v1.221.0	codex/dag-github-concurrent-output	GitHub Actions output for concurrent Terraform plan CI verification
Tracking	#2467	Open draft	codex/dag-concurrent-execution-tracker	Rollout plan and coordination document

Planned PRs

Step	Intended base	Proposed branch	Scope
PR 8	main after PR 7 merge	codex/dag-terraform-interactive-output	TUI/interactive output for non-CI Terraform plan/apply/destroy
PR 9	PR 8	codex/dag-mixed-type-adapters	Mixed-type DAG adapters
PR 10	PR 9	codex/dag-scheduling-diagnostics	Advanced scheduling diagnostics

Validation

Tracker update only. Verified the v1.221.0 release exists and is published; local go build -buildvcs=false -o build/atmos . succeeds.

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Files

None

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #2460. Mergify cannot evaluate rules on this PR. Once #2460 is merged or closed, Mergify will resume processing this PR. ⚠️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.03%. Comparing base (aa223e0) to head (404cd05).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2467      +/-   ##
==========================================
+ Coverage   79.01%   79.03%   +0.01%     
==========================================
  Files        1210     1210              
  Lines      117219   117219              
==========================================
+ Hits        92620    92643      +23     
+ Misses      19521    19494      -27     
- Partials     5078     5082       +4     

Flag	Coverage Δ
unittests	79.03% <ø> (+0.01%)	⬆️

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