}

    /**
     * Builds a smart summary of the assistant message for history.
     * Preserves the beginning (direct answer) and end (conclusion) of long responses,
     * omitting the middle section, and appends source titles.
     *
     * @param msg the assistant chat message
     * @param maxChars the maximum characters for the summary
     * @return the summarized content with source titles

    editor.setString(0, "a")
    editor.setString(1, "a")
    cache.evictAll()

    // Create a new value in its place.
    set("k1", "bb", "bb")
    assertThat(cache.size()).isEqualTo(4)

    // Committing the detached editor should not change the cache's size.
    editor.commit()
    assertThat(cache.size()).isEqualTo(4)
    assertValue("k1", "bb", "bb")
  }

  @Test

# Sets the default Apple platform to macOS.
common:macos --apple_platform_type=macos

# gRPC on MacOS requires this #define
common:macos --copt=-DGRPC_BAZEL_BUILD

# Avoid hitting command line argument limit
common:macos --features=archive_param_file

# TODO: Fix deps to remove this flag, see https://github.com/bazelbuild/bazel/pull/16414
common:macos --linkopt=-Wl,-undefined,dynamic_lookup

            }
            if (turnLen <= remaining) {
                remaining -= turnLen;
                firstIncludedTurn = t;
            } else {
                break; // Stop at first non-fitting turn to maintain contiguous recency
            }
        }

        if (firstIncludedTurn < turns.size()) {
            for (int t = firstIncludedTurn; t < turns.size(); t++) {

const (
	letterIdxBits = 6                    // 6 bits to represent a letter index
	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

// Random number state.
// We generate random temporary file names so that there's a good
// chance the file doesn't exist yet.
var (
	randN  uint32
	randmu sync.Mutex
)