fix(opencode): retry transient provider failures and tool-call diff/input errors

[pkellyuk]

Issue for this PR

Closes #15851
Closes #15906

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

This PR fixes two cases where sessions stopped instead of recovering:

1. Retries transient local provider connection failures (ECONNREFUSED, ECONNRESET, nested socket causes).
2. Retries provider tool-call stream failures like Invalid diff: now finding less tool calls! by marking them retryable.
3. Repairs malformed tool input JSON (including JSON parsing failed: Text: ...) in experimental_repairToolCall so tool execution can continue.

Together these changes reduce hard-aborts in tool-heavy sessions and route recoverable failures into the existing retry path.

How did you verify your code works?

From packages/opencode:

• bun test test/session/retry.test.ts test/session/llm.test.ts

Added/updated regression tests for:

• ECONNREFUSED and related transient network errors
• invalid tool-call diff retry classification
• malformed/truncated tool input JSON repair

Screenshots / recordings

N/A (non-UI behavior)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

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Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[pkellyuk]

Added follow-up commit 05f1bb8 for another real-world tool-call failure:\n\n- repairs write calls where model outputs filepath/path aliases instead of filePath\n- handles tool-error while tool state is pending (prevents fallback to generic \Tool execution aborted)\n\nNew regression test added in \session/llm.test.ts\ for the \�xpected string, received undefined\ filePath case.