chore(issues): Standardize issue forms around packet schema

[stickerdaniel]

Problem

Incoming issues frequently lack crucial diagnostic context (runtime, account product, UI locale) or duplicate existing work because issue templates lack unified required fields and search verification.

Solution

• Standardize all four issue forms (bug_report.yml, feature_request.yml, documentation_issue.yml, chore.yml) around the packet contract (packet-summary, related-issues, evidence, steps-to-reproduce, plus setup and linkedin-variant for runtime reports).
• Add tests/test_issue_packet_contract.py validating required IDs, placeholder formats, plain text, and route preservation.
• Decouple tests/test_error_diagnostics.py from deleted form labels and update transitional diagnostics text.

Verification

• uv run pytest tests/test_issue_packet_contract.py tests/test_error_diagnostics.py (17 passed)
• uv run ruff check . and uv run ruff format --check . passed
• uv run ty check passed
• Pre-commit hooks passed

Closes #989

Synthetic prompt

Standardize issue forms around the packet schema contract. Update bug_report, feature_request, documentation_issue, and chore templates with common required IDs, add PyYAML contract tests in tests/test_issue_packet_contract.py, and decouple diagnostics tests.

Generated with Claude Code (gemini-3.8-flash-high), planned with Astra

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, or repository-rule violations identified.

Summary

This PR standardizes the four GitHub issue forms around a shared diagnostic packet and updates generated error guidance to treat diagnostic files as redacted supporting material.

• Adds common required packet, related-issue, evidence, and reproduction fields.
• Adds runtime and LinkedIn-account context to bug and feature forms.
• Introduces contract tests for required IDs, uniqueness, defaults, routing, and public text.
• Decouples generated diagnostic notes from the issue form’s former labels.

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