fix(daemon): reduce comment context usage

[drybalka-s]

Summary

• Reduce daemon context usage by making comment reads default to a recent-thread window and adding compact --summary output for long issue histories.
• Keep full comment history available behind explicit --all for assignment flows that truly need it.
• Trim persisted tool-result output and coalesce adjacent transcript text/thinking chunks in the UI.
• Harden agent-authored issue comments by removing inline --content "..." from daemon reply prompts and requiring --content-file on Windows or single-quoted HEREDOC stdin on Linux/macOS.

Problem solved

Long-running issues were pushing too much comment history and tool output into agent context. Some daemon prompts also still showed inline --content "...", which let the shell expand $(), variables, quotes, and code snippets before multica received the comment body.

Validation

• go test ./cmd/multica -run TestResolveTextFlag
• go test ./internal/daemon/execenv -run 'TestBuildCommentReplyInstructions|TestInjectRuntimeConfigCommentTriggerUsesHelper|TestInjectRuntimeConfigWindowsCommentTriggerHasNoStdin|TestInjectRuntimeConfigCodexLinuxEmphasizesStdin'
• Rebuilt patched multi-arch CLI/daemon binaries and verified multica v0.3.4-patched on linux/amd64.
• Live daemon log now shows --recent 20 --summary --output json and cat <<'COMMENT' | multica issue comment add ... --content-stdin for pi.

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