feat: enforce limit-ratio quality gate and bump 0.8.0

[SummerOneTwo]

Summary

• enforce final-test sampling to prioritize limit-oriented coverage: by default, at least half of generated tests are type=3/4 (extreme/tle) when candidates are sufficient
• add manifest-backed problem_verify_testslimit_ratio quality gate (default enabled, explicit opt-out via enable_limit_ratio=false), and add tests for pass/fail/default/opt-out behavior
• sync workflow/docs and bump project/plugin/package versions to 0.8.0

Test plan

• uv run pytest tests/ -q
• uv run ruff check .
• uv run mypy src/
• claude plugin validate .

[Copilot]

Pull request overview

This PR introduces a “limit-oriented coverage” quality gate by enforcing that the final generated test set contains at least 50% extreme/TLE cases (type=3/4) when possible, adds a manifest-backed verification check for the ratio (enabled by default with explicit opt-out), and bumps project/plugin/package versions to 0.8.0.

Changes:

• Update problem_generate_tests sampling to prioritize type=3/4 for at least half of final tests and emit a .autocode_tests_manifest.json manifest plus ratio stats.
• Add problem_verify_testslimit_ratio check (default enabled; opt-out via enable_limit_ratio=false) with unit tests for pass/fail/default/opt-out behavior.
• Sync documentation/workflow guidance and bump version strings to 0.8.0.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
uv.lock	Bumps editable package version to 0.8.0.
pyproject.toml	Updates project version to 0.8.0.
src/autocode_mcp/__init__.py	Updates __version__ to 0.8.0.
.claude-plugin/plugin.json	Bumps plugin manifest version to 0.8.0.
tests/test_packaging.py	Updates version assertion to 0.8.0.
tests/test_plugin_manifest.py	Updates plugin manifest version assertion to 0.8.0.
src/autocode_mcp/tools/problem.py	Enforces limit-case quota in sampling, writes test manifest, and returns new limit-ratio stats.
src/autocode_mcp/tools/test_verify.py	Adds manifest-backed limit_ratio verification with default enable + explicit opt-out.
tests/test_tools/test_problem.py	Adds tests for limit_ratio verification and the new sampling quota behavior.
src/autocode_mcp/prompts/__init__.py	Updates prompts to reflect the new sampling policy.
README.md	Documents the new generation policy and verification gate.
skills/autocode-workflow/SKILL.md	Updates workflow/quality gate documentation for the 50% extreme/TLE threshold.
agents/autocode-workflow.md	Updates agent instructions to enforce the quality requirement during test generation.
scripts/workflow_guard.py	Updates workflow guard messaging to reflect the new preference/requirement.
CLAUDE.md	Syncs workflow step documentation with the new quality threshold.
CHANGELOG.md	Adds 0.8.0 release notes describing the new gate and behavior.

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