Fix LD2450 buffer overflow during initialization

[bharvey88]

Summary

Adds rx_buffer_size: 1024 to the uart_ld2450 configuration to prevent buffer overflow during device initialization.

Problem

The LD2450 sensor randomly stops detecting after several hours of operation. Root cause analysis (esphome/esphome#13956) revealed:

• Default 256-byte UART buffer overflows during boot
• ~750 bytes accumulate during 2-second dump_config() block
• Overflow corrupts initialization commands
• Sensor enters broken state causing detection failures

Solution

Increase rx_buffer_size to 1024 bytes to accommodate data accumulation during boot sequence.

Testing

• Compile and flash to R_PRO-1 device
• Verify LD2450 sensor initializes correctly
• Confirm detection remains stable over extended period (24+ hours)
• No factory resets should be required

Fixes esphome/esphome#13956

Summary by CodeRabbit

• Chores
  • Optimized UART receiver buffer configuration for improved device communication stability.

[coderabbitai]

Walkthrough

Increases the UART receiver buffer size for the LD2450 sensor integration from its default to 1024 bytes in the ESPHome core configuration file, addressing a data reception issue causing detection drops.

Changes

Cohort / File(s)	Summary
LD2450 UART Configuration Integrations/ESPHome/Core.yaml	Added rx_buffer_size: 1024 to uart_ld2450 configuration to expand receiver buffer capacity.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

bugfix

Suggested reviewers

• TrevorSchirmer

Poem

🐰 A tiny tweak, a buffer grows,
One-zero-two-four, the data flows,
LD2450 shall not slip away,
Detection stays throughout the day! ✨

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix LD2450 buffer overflow during initialization' directly and specifically describes the main change: adding rx_buffer_size to prevent UART buffer overflow during device initialization.
Linked Issues check	✅ Passed	The PR addresses the root cause identified in #13956 by increasing the UART RX buffer size from 256 to 1024 bytes to accommodate the ~750-byte data burst during initialization, preventing buffer overflow that corrupted initialization commands.
Out of Scope Changes check	✅ Passed	The change is narrowly scoped to the uart_ld2450 configuration, adding only the rx_buffer_size parameter without any extraneous modifications unrelated to fixing the buffer overflow issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into beta

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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No actionable comments were generated in the recent review. 🎉

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