Remove deprecated Copilot model aliases from built-in alias and multiplier registries

[Copilot]

This change removes gpt-4o-mini, gpt-4.1, gpt-4o, and gpt-5.4-nano from the Copilot-facing built-in model alias/multiplier surface, and adds guardrails so they are not reintroduced via routine data updates.

• Built-in alias map cleanup

  • Removed the gpt-4.1 alias from /home/runner/work/gh-aw/gh-aw/pkg/workflow/data/model_aliases.json.
  • Updated alias expectations in /home/runner/work/gh-aw/gh-aw/pkg/workflow/model_aliases_test.go to reflect the removed key.

• Model multiplier registry cleanup

  • Removed gpt-4o-mini, gpt-4.1, gpt-4o, and gpt-5.4-nano from:
    • /home/runner/work/gh-aw/gh-aw/pkg/cli/data/model_multipliers.json
    • /home/runner/work/gh-aw/gh-aw/actions/setup/js/model_multipliers.json
  • This keeps runtime and setup-action multiplier sources aligned.

• Regression prevention

  • Added explicit negative assertions in /home/runner/work/gh-aw/gh-aw/pkg/cli/effective_tokens_test.go to ensure the removed model IDs stay absent.

• Generated/docs alignment

  • Updated model tables in /home/runner/work/gh-aw/gh-aw/docs/src/content/docs/reference/model-tables.md.
  • Refreshed impacted wasm golden fixtures after alias output changes.

{
  "aliases": {
    "gpt-4.1": ["copilot/gpt-4.1*", "openai/gpt-4.1*"]
  },
  "multipliers": {
    "gpt-4o": 0.33,
    "gpt-4o-mini": 0.33,
    "gpt-4.1": 1.0,
    "gpt-5.4-nano": 6.0
  }
}

After this PR, those entries are intentionally absent from built-in alias/multiplier data.

[pelikhan]

@copilot update the agentic workflow model multiplier update to keep ignoring these models. make recompile.

[Copilot]

Pull request overview

Removes deprecated Copilot model aliases (gpt-4o, gpt-4o-mini, gpt-4.1, gpt-5.4-nano) from the built-in alias and multiplier registries, updates tests with negative-assertion guardrails, and refreshes generated docs/golden fixtures.

Changes:

• Drop gpt-4.1 from model_aliases.json (and updated alias-family expectations + a NotContains assertion in tests).
• Drop gpt-4o, gpt-4o-mini, gpt-4.1, gpt-5.4-nano from both pkg/cli/data/model_multipliers.json and actions/setup/js/model_multipliers.json, with a new test (TestModelMultipliersRemovedCopilotAliases) guarding regression.
• Regenerate docs/reference/model-tables.md and refresh affected wasm golden fixtures to reflect the smaller alias/multiplier surface.

Show a summary per file

File	Description
pkg/workflow/data/model_aliases.json	Remove deprecated gpt-4.1 builtin alias
pkg/workflow/model_aliases.go	Doc comment updated to drop gpt-4.1 from the listed families
pkg/workflow/model_aliases_test.go	Adjust family lists; add negative assertion for gpt-4.1
pkg/cli/data/model_multipliers.json	Remove deprecated multiplier keys
actions/setup/js/model_multipliers.json	Mirror multiplier removals for setup-action source
pkg/cli/effective_tokens_test.go	Drop removed gpt-5.4-nano assertion; add NotContains regression test
docs/src/content/docs/reference/model-tables.md	Regenerated tables without removed entries
pkg/workflow/testdata/TestWasmGolden_/.golden	Refresh emitted AWF config to drop gpt-4.1 from apiProxy.models

Copilot's findings

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• Files reviewed: 16/16 changed files
• Comments generated: 0

[Copilot]

@copilot update the agentic workflow model multiplier update to keep ignoring these models. make recompile.

Addressed in cd05179.

[github-actions]

``
@copilot request a fresh check run to clear the BLOCKED merge state.

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