Add session export to HTML, improve tool error handling, and enhance RPC mode documentation

packages/coding-agent/poem.txt

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+Through morning mist the sunlight breaks,
+A golden path on silver lakes,
+The world awakens, soft and new,
+With diamond drops of morning dew,
+And birds sing songs that daylight makes.
+
+The forest stands in ancient green,
+Where shadows dance and light is seen,
+Through branches high the breezes play,
+And lead the wandering heart away,
+To places only dreams have been.
+
+The river flows with endless grace,
+Its waters mirror time and space,
+It carries stories, old and worn,
+Of every soul that's ever born,
+And every smile on every face.
+
+When evening falls with purple hue,
+The stars emerge in cosmic view,
+They whisper secrets from afar,
+Each distant, shimmering, silent star,
+A reminder what we thought we knew.
+
+So let us walk this earthly ground,
+Where beauty, pain, and love are found,
+Embrace the journey, come what may,
+For every night will yield to day,
+And silence always turns to sound.