Raise http_request rx buffer to 5120 for GitHub's CSP header

[bharvey88]

Version: 26.7.8.7

What does this implement/fix?

Follow-up to #93: the 2048-byte rx buffer is still too small. The redirect on GitHub release-asset downloads carries a ~3.6 KB Content-Security-Policy header line, and esp_http_client requires each header line to fit the rx buffer - so beta manifest fetches kept failing with HTTP_CLIENT: Out of buffer even on 26.7.8.6 (confirmed on hardware; measured Content-Security-Policy at 3585 bytes today). Raised to 5120 for headroom.

Silver lining from the same hardware test: #93's manifest guard worked - after the failed fetch it refused to install, so no wrong-channel downgrade and no lost WiFi this time.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Increased network receive buffering for several device configurations to better handle larger download redirects and response headers, reducing “out of buffer” failures.
  • Updated one integration version to the latest release number.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5b94e0a7-7bca-4468-9095-7ba39d221ce8

📥 Commits

Reviewing files that changed from the base of the PR and between 34c7677 and 0b7f590.

📒 Files selected for processing (4)

• Integrations/ESPHome/Core.yaml
• Integrations/ESPHome/MSR-1.yaml
• Integrations/ESPHome/MSR-1_BLE.yaml
• Integrations/ESPHome/MSR-1_Factory.yaml

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Walkthrough

This PR increases the http_request buffer_size_rx from 2048 to 5120 bytes in three ESPHome MSR-1 YAML configurations to prevent "HTTP_CLIENT: Out of buffer" errors from large redirect headers, updates related comments, and bumps the version substitution in Core.yaml.

Changes

ESPHome config updates

Layer / File(s)	Summary
HTTP request receive buffer increase Integrations/ESPHome/MSR-1.yaml, Integrations/ESPHome/MSR-1_BLE.yaml, Integrations/ESPHome/MSR-1_Factory.yaml	buffer_size_rx increased from 2048 to 5120 in each file, with comments updated to explain redirect/CSP header buffering issues.
Version substitution bump Integrations/ESPHome/Core.yaml	The version substitution value incremented from 26.7.8.6 to 26.7.8.7.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• ApolloAutomation/MSR-1#93: Both PRs adjust the ESPHome http_request receive buffering for GitHub release-asset redirect responses in the MSR-1 YAMLs.
• ApolloAutomation/MSR-1#85: Both PRs modify the substitutions.version value in Integrations/ESPHome/Core.yaml.
• ApolloAutomation/MSR-1#73: Both PRs bump the ESPHome version substitution value in Integrations/ESPHome/Core.yaml.

Suggested reviewers: TrevorSchirmer

Poem

A rabbit hopped through YAML fields so wide,
Found buffers small where headers couldn't hide.
With 5120 bytes, now room to spare,
No more "Out of buffer" errors in the air! 🐰
Version ticked up, one hop more —
Onward to 26.7.8.7! 🥕

🚥 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 accurately summarizes the main change: increasing the http_request receive buffer to handle GitHub CSP headers.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-buffer-size

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