feat(workflow): script iteration, replay provenance, and call inspection

[Waishnav]

Summary

• stop promoting the placeholder budget primitive in the Dynamic Workflows skill
• make persisted workflow scripts first-class across CLI/MCP, including scriptPath + resumeFromRunId
• recompute script hashes after edits and snapshot every invocation into its own run directory
• persist replay provenance and miss explanations (same_index vs compatible_key)
• add workflow calls / workflow call inspection commands and MCP call summaries
• teach the edit → inspect → resume recovery loop and filesystem side-effect caveat

Stack

• Base: pr/dw-8-result-errors (PR refactor(workflow): model operational failures with better-result #101)
• Branch: pr/dw-9-resume-iteration-inspection
• Foundation for two alternative error-handling experiments; this PR intentionally changes neither workflow thrown-error semantics nor the primitive API.

Test plan

• npm run typecheck
• npm test
• npm run build
• git diff --check
• replay tests cover same-index, compatible-key, consumed results, and changed prompt explanations
• store tests cover prompt/schema/replay/error provenance persistence

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