docs: document fieldpath semantics in Unstructured.SetValue

[boxcee-interview]

Closes #49

Summary

Add documentation to the SetValue method on composed.Unstructured explaining:

• How dot notation works in field paths (dots are separators, not literal characters)
• That keys containing dots create nested maps when using SetValue
• Alternative methods (SetLabels, SetAnnotations) for setting label/annotation keys with dots
• That SetLabels and SetAnnotations replace the entire map

How to Test

Review the godoc comment on SetValue at resource/composed/composed.go. No behavioral changes — documentation only.

Build and tests pass: go build ./... and go test ./...

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 689f1889-edfd-42d8-a851-51a20f559672

📥 Commits

Reviewing files that changed from the base of the PR and between 1cb7c55 and 7445b67.

📒 Files selected for processing (1)

• resource/composed/composed.go

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📝 Walkthrough

Walkthrough

A multi-line doc comment is added to (*Unstructured).SetValue in resource/composed/composed.go. The comment explains that dot-delimited field paths are interpreted as nested maps, shows the resulting YAML structure, and directs callers to use SetLabels or SetAnnotations when their keys contain dots. No logic was changed.

Changes

SetValue dot-notation documentation

Layer / File(s)	Summary
SetValue doc comment resource/composed/composed.go	Adds a 20-line comment block above (*Unstructured).SetValue documenting how dot-delimited paths produce nested maps and advising use of SetLabels/SetAnnotations for label/annotation keys that themselves contain dots.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the change: adding documentation about fieldpath semantics to the SetValue method.
Description check	✅ Passed	The description clearly relates to the changeset, explaining the documentation additions and how they address the issue about dot notation in field paths.
Linked Issues check	✅ Passed	The PR fully addresses issue #49 by documenting SetValue behavior with dotted keys and recommending SetLabels/SetAnnotations as alternatives.
Out of Scope Changes check	✅ Passed	All changes are focused on documentation for the SetValue method without any functional modifications, remaining within scope.
Breaking Changes	✅ Passed	This PR only adds godoc documentation to the existing SetValue method—no exported functions, types, methods, fields, or signatures were modified. No behavioral changes to public APIs detected.

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