feat(skills): add Terramate migration reference to atmos-migration

[Erik Osterman (Cloud Posse) (osterman)]

what

• Adds a new references/from-terramate.md reference file to the atmos-migration agent skill, giving a construct-by-construct mapping from a Terramate project to Atmos: stack.tm.hcl, hierarchical globals, generate_hcl mixins/generators, script{} orchestration, tags/labels, tm_* functions, Terramate Cloud sync, the _bootstrap/ two-phase pattern, and .tmtriggers/.
• Wires the new reference into atmos-migration/SKILL.md's frontmatter, "Decide the Migration Shape First" routing table, and "Additional Resources" section, following the same pattern already used for native-Terraform and Terraform-Workspaces migrations.
• Updates the atmos-migration row in agent-skills/AGENTS.md's skill index to mention Terramate.
• Documents the real, shipped metadata.tags/metadata.labels syntax, --tags/--labels CLI filtering, and --include-dependencies/--include-dependents closure selection, and flags the one remaining gap: no Atmos equivalent to Terramate's .tmtriggers/ change-detection overrides.

why

• Atmos already has an atmos-migration skill for native Terraform and Terraform Workspaces (and explicitly calls out Terragrunt as unsupported); Terramate was the next common migration source with no guidance, so this extends the existing pattern rather than introducing a new skill.
• Keeps the skill from steering agents toward stale advice — an earlier draft of this reference treated Atmos tags/labels as a total gap, but that support has since shipped (feat: tags and labels standard for auth, components, and bulk selection #2738, feat: dependency-closure selection (--include-dependencies/--include-dependents) + scope --labels/--tags evaluation before filtering #2807, feat(stacks): support global-scope metadata defaults #2808, feat(workflow): support tags and labels selectors #2857), so the reference documents the real syntax instead.

references

• Related to the tags/labels work shipped in feat: tags and labels standard for auth, components, and bulk selection #2738, feat: dependency-closure selection (--include-dependencies/--include-dependents) + scope --labels/--tags evaluation before filtering #2807, feat(stacks): support global-scope metadata defaults #2808, feat(workflow): support tags and labels selectors #2857.

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⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: c8115c9d-f03a-4bb9-9a99-29a2a8b146f7

📥 Commits

Reviewing files that changed from the base of the PR and between 13bce50 and 605dba2.

📒 Files selected for processing (3)

• agent-skills/AGENTS.md
• agent-skills/skills/atmos-migration/SKILL.md
• agent-skills/skills/atmos-migration/references/from-terramate.md

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Dependency Review

✅ No vulnerabilities or license issues found.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.75%. Comparing base (13bce50) to head (605dba2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2871      +/-   ##
==========================================
- Coverage   82.75%   82.75%   -0.01%     
==========================================
  Files        1860     1860              
  Lines      180337   180337              
==========================================
- Hits       149240   149236       -4     
- Misses      23309    23314       +5     
+ Partials     7788     7787       -1     

Flag	Coverage Δ
unittests	82.75% <ø> (-0.01%)	⬇️

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