docs: describe passing undeclared parameters at submission

[Joibel]

• Ran make pre-commit -B (docs only; docs-lint/docs-spellcheck tooling isn't installed locally, relying on CI)
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Related to #13035

Motivation

#13035 asks for the UI to allow arbitrary parameter input the way the CLI does. Looking into it, the CLI behaviour it refers to has never been documented anywhere, so a user has no way of knowing it exists.

argo submit -p NAME=VALUE does not check the name against the spec: overrideParameters in workflow/util/util.go builds a fresh parameter list from whatever you pass and appends the spec's own parameters afterwards. SubmitWorkflow calls that before validate.Workflow, so a value you supply resolves. On the other side, validate.go deliberately lets a WorkflowTemplate keep unresolved {{workflow.parameters.*}} references, with the comment "some of the parameters may come from the Workflow that uses it".

So a WorkflowTemplate can reference a global parameter it never declares and have the value supplied at submission time. That is exactly the use case in #13035 ("one that has no default or if you have some indirection"), and the docs only ever describe -p as overriding parameters that are already declared.

Modifications

Two paragraphs:

• docs/walk-through/parameters.md: -p is not restricted to the parameters a spec lists, plus the failure mode when you forget to pass one.
• docs/workflow-templates.md: the same point for argo submit --from workflowtemplate/....

Verification

Read against the code paths named above rather than re-derived from the docs. The error message quoted in the walk-through is the literal string from validateTemplateType's tag resolution failure.

Documentation

This PR is the documentation.

AI

Claude Code was used to research whether the behaviour was documented and to draft the two paragraphs. I checked the code paths it cited and edited the wording. Commit message and PR description reviewed by me.

Summary by CodeRabbit

• Documentation
  • Clarified that workflow submissions can provide parameters not explicitly declared in the workflow or template.
  • Documented that undeclared parameters can be referenced when values are supplied at submission time.
  • Noted that missing values cause submission validation errors and recommended declaring parameters with defaults.

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📝 Walkthrough

Walkthrough

The documentation explains that -p accepts undeclared parameters, requires values on each submission, and fails validation when a value is missing. It recommends declaring a default when appropriate.

Changes

Submission parameter documentation

Layer / File(s)	Summary
Document undeclared submission parameters docs/walk-through/parameters.md, docs/workflow-templates.md	The guides describe undeclared parameters, required submission values, validation failure for missing values, and cases where a default is not available.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 15baa

This documentation-only change is localized and introduces no actionable merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main documentation change: documenting submission of undeclared parameters.
Description check	✅ Passed	The description follows the repository template and includes motivation, modifications, verification, documentation, AI usage, checklist status, and issue context. It appropriately explains that tests…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description follows the repository template and includes motivation, modifications, verification, documentation, AI usage, checklist status, and issue context. It appropriately explains that tests are not applicable because the change is documentation-only.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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Inline comments:
In `@docs/walk-through/parameters.md`:
- Line 91: Reformat the prose around the documented -p behavior so each of its
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