fix: improve startup and feedback diagnostics - #242
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This PR makes backend startup failures such as #239 actionable and keeps feedback provenance trustworthy. Beam now captures a bounded stderr tail for startup and worker-exit failures, refreshes the source commit when reusing an identical installed runtime, and reports the full source commit plus runtime payload in feedback cards.
The stderr capture remains isolated from MCP stdio, runs on a dedicated task, is capped at 16 KiB, and preserves valid UTF-8 when truncation lands inside a character. Runtime reuse updates only source provenance, preserving the original creation-toolchain metadata.