chore: bump default Redis resources to 2 CPU / 4Gi

[brendan-kellam]

Bumps the default Redis (Valkey) primary resource requests and limits from 1 CPU / 1.5Gi to 2 CPU / 4Gi.

• charts/sourcebot/values.yaml: redis.primary.resources requests and limits set to cpu: "2", memory: "4Gi"
• charts/sourcebot/README.md: regenerated with helm-docs
• CONTRIBUTING.md: raised the minikube memory recommendation from 12GB to 16GB, since default memory requests now total 12Gi (Sourcebot 4Gi + PostgreSQL 4Gi + Redis 4Gi)
• CHANGELOG.md: added an Unreleased entry

helm lint passes.

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Note

Low Risk
Default Helm values and docs only; upgrades may need more cluster capacity unless operators override redis.primary.resources.

Overview
Raises the default bundled Redis/Valkey (redis.primary) Kubernetes requests and limits from 1 CPU / 1.5Gi to 2 CPU / 4Gi, aligning Redis with the chart’s existing Sourcebot and PostgreSQL defaults.

charts/sourcebot/values.yaml carries the change; charts/sourcebot/README.md is refreshed via helm-docs. CONTRIBUTING.md bumps the recommended minikube memory from 12GB to 16GB so local installs can satisfy the higher default request total (~12Gi across the three workloads). CHANGELOG.md records the change under Unreleased.

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Summary by CodeRabbit

• Configuration
  • Default Redis resources have increased to 2 CPU and 4 GiB of memory.
  • The documented minimum memory requirement has increased to 16 GB. The Minikube example now uses 16 GB of memory.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: f38c7cb2-1ee2-4eaf-b700-f4e3aae5f220

📥 Commits

Reviewing files that changed from the base of the PR and between 93d81ad and 8b524b2.

📒 Files selected for processing (4)

• CHANGELOG.md
• CONTRIBUTING.md
• charts/sourcebot/README.md
• charts/sourcebot/values.yaml

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Walkthrough

Redis resource requests and limits in the chart increase to 2 CPU and 4Gi memory. The documentation records these values and updates the minimum memory and minikube memory settings for local Kubernetes setup.

Changes

Resource updates

Layer / File(s)	Summary
Redis resource values charts/sourcebot/values.yaml, charts/sourcebot/README.md, CHANGELOG.md	Redis CPU requests and limits increase to 2, and memory requests and limits increase to 4Gi. The README and changelog record the updated values.
Local Kubernetes memory requirements CONTRIBUTING.md	The documented minimum memory increases to 16GB, and the minikube example sets memory to 16384 MB.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~5 minutes

Change: Other

Suggested reviewers: msukkari

Merge Risk: ⚪ Minimal · up to 8b524

The higher Redis defaults intentionally require additional cluster capacity, with overrides available for smaller installations. No actionable merge-blocking regression remains; normal chart checks should complete before merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: increasing the default Redis resources to 2 CPU and 4Gi memory.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Helm Unit Test Results

20 tests  ±0   20 ✅ ±0   0s ⏱️ ±0s
 3 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 8b524b2. ± Comparison against base commit 93d81ad.