test: add deterministic scout validation

[gkmraju]

Summary

Adds focused pull-request validation for the standalone Top Quant Gits scout without changing its default runtime behavior.

Changes

• adds deterministic tests for repository ranking, digest rendering, default category integrity, and seen-repository persistence
• allows tests to supply an explicit clock to the pure ranking and digest functions while preserving the existing real-time default
• adds read-only pull-request CI on Python 3.11 and 3.13
• documents the local validation commands

Validation

• py -3.13 -m unittest discover -s tests -v — 9 tests passed
• py -3.13 -m compileall -q top_quant_gits tests — passed
• git diff --check — passed

Scope

• no GitHub API search was performed during validation
• no Telegram message was sent
• the scheduled daily workflow and committed output/latest_digest.md were not changed
• existing draft PR chore: add fallback contribution workspace #1 is unrelated and remains untouched
• this remains a separate project from GitHub-Contribution-Agent

Summary by Sourcery

Add deterministic validation for repository ranking, digest generation, categories, and seen-repository storage.

Enhancements:

• Make repository ranking and digest generation deterministic when supplied with an explicit reference time while retaining real-time defaults.

CI:

• Add read-only pull-request CI across Python 3.11 and 3.13 for unit tests and source compilation.

Documentation:

• Document local validation commands that avoid external GitHub and Telegram calls.

Tests:

• Add deterministic coverage for ranking behavior, digest output, default category integrity, and seen-repository persistence.

[sourcery-ai]

Reviewer's Guide

Adds deterministic, clock-controllable ranking and digest generation, introduces focused tests for ranking, digest, store, and categories, and wires a read-only pull-request CI workflow that runs those tests and compile checks on Python 3.11 and 3.13 while documenting the validation commands in the README.

Sequence diagram for deterministic ranking and digest generation

sequenceDiagram
    actor Developer
    participant Tests
    participant Ranker as score_repositories
    participant DigestMD as build_markdown_digest
    participant DigestTG as build_telegram_link_digest

    Developer->>Tests: run unittest
    Tests->>Ranker: score_repositories(category, repos, now=fixed_datetime)
    Ranker-->>Tests: ranked_repos

    Tests->>DigestMD: build_markdown_digest(categories, ranked_repos, top_n, generated_at=fixed_datetime)
    DigestMD-->>Tests: markdown_digest

    Tests->>DigestTG: build_telegram_link_digest(categories, ranked_repos, top_n, generated_at=fixed_datetime)
    DigestTG-->>Tests: telegram_digest

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File-Level Changes

Change	Details	Files
Make repository scoring deterministic by allowing an explicit reference time without changing default runtime behavior.	Extend the scoring function signature with an optional now parameter used as a reference clock. Compute age and idle days using the provided reference time while retaining the previous behavior when no value is passed. Add unit tests that exercise ranking order, keyword matching, tie-breaking, and future-dated repositories with a fixed clock. Introduce a small test helper for constructing RepoCandidate instances with sensible defaults.	top_quant_gits/ranker.py tests/test_ranker.py tests/helpers.py tests/__init__.py
Make digest rendering reproducible by allowing callers to supply a fixed generation timestamp.	Add an optional generated_at parameter to markdown and Telegram digest builders. Derive formatted text from the supplied timestamp when present, falling back to the current UTC time by default. Add tests that assert stable markdown and Telegram output, including headers, scores, links, and empty-category messaging.	top_quant_gits/digest.py tests/test_digest.py
Verify store and category integrity with deterministic filesystem and configuration tests.	Add tests for SeenRepoStore covering behavior for missing files and round-trip save/load with sorted, deduplicated repos. Add tests that assert default categories have unique slugs and non-empty search terms and keywords.	tests/test_store_and_categories.py
Introduce a scoped CI workflow that runs deterministic tests and compile checks on pull requests only.	Add a GitHub Actions workflow that triggers on pull_request and manual dispatch with read-only repository permissions. Set up a Python version matrix for 3.11 and 3.13 and install the project in editable mode. Run the unittest test suite and compileall against the package and tests as part of CI.	.github/workflows/ci.yml
Document the local validation commands alongside the project description.	Extend README with a validation section describing the deterministic test suite and compile checks. Show equivalent local commands for running unit tests and compile checks without hitting external services.	README.md

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