fix: resolve TypeScript typecheck errors in JS files

[Copilot]

The js-typecheck CI job was failing with 8 TypeScript errors across 4 files introduced by stricter type inference.

Changes

• aw_context.cjs: Add parentheses to JSDoc type cast — /** @type {T} */ (expr) is required syntax; without them the cast is silently ignored and TypeScript sees object instead of Record<string, unknown>

• handle_agent_failure.cjs: Remove erroneous /** @type {Array<any>} */ annotations on resolvedItems — the optional items param is Array<any> | undefined, conflicting with the forced Array<any> annotation; TypeScript narrows correctly after the null-check/early-return block without the annotation

• handle_agent_failure.cjs + missing_info_formatter.cjs: Widen formatMissingTools and escapeMarkdown parameter types to accept string | null, matching the actual return type of loadMissingToolMessages (tool field is string | null)

• pick_experiment.cjs: Add ms != null && guard before ms > 0 (TypeScript doesn't narrow through Number.isInteger); use ?? 0 fallback for minSamples since the outer progressNames filter already guarantees it's a positive integer

• setup_globals.cjs: Change @param {typeof github} to @param {any} — typeof github created a TS2502 circular self-reference because TypeScript was inferring the global github type through the global.github = createRateLimitAwareGithub(githubModule) assignment in the same function

[Copilot]

Pull request overview

Resolves js-typecheck CI failures by adjusting JSDoc typing and adding small runtime guards so TypeScript can correctly narrow types in @ts-check’d .cjs files.

Changes:

• Fix JSDoc cast syntax in aw_context.cjs so TypeScript applies the intended Record<string, unknown> type.
• Align missing-tool formatting types with actual nullable fields produced by agent-output parsing.
• Add null/undefined guards and safe fallbacks in experiment summary generation; relax a problematic JSDoc type in globals setup to avoid circular typing.

Show a summary per file

File	Description
actions/setup/js/setup_globals.cjs	Adjusts JSDoc typing for the injected GitHub client/module parameter to avoid a TS circular reference.
actions/setup/js/pick_experiment.cjs	Adds an explicit nullish guard for min_samples filtering and a ?? 0 fallback for summary calculations.
actions/setup/js/missing_info_formatter.cjs	Widens formatter JSDoc types to accept nullable tool/alternatives values and nullable/undefined text.
actions/setup/js/handle_agent_failure.cjs	Removes overly-forcing JSDoc annotations so TypeScript can narrow optional items correctly.
actions/setup/js/aw_context.cjs	Fixes JSDoc cast syntax by adding parentheses so the cast is not ignored by TypeScript.

Copilot's findings

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• Files reviewed: 5/5 changed files
• Comments generated: 2