feat(intake): import external observability traces (#1323)

* feat(intake): import external observability traces

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

* fix(intake): sync import API generated surfaces

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

* fix(intake): harden observability imports

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

* fix(intake): address observability import review

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

* fix(intake): harden importer transport pagination

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

* docs(intake): remove observability import plan

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

---------

Signed-off-by: Brian Newsom <brnewsom@nvidia.com>

Author: BrianNewsom

docs/cli/reference.mdx

@@ -6544,6 +6544,7 @@ nemo intake ingest [OPTIONS] COMMAND [ARGS]...
 * `atif`: Manage atif
 * `chat-completions`: Manage chat_completions
 * `otlp`: Otlp operations
+* `spans`: Manage spans
 
 ##### nemo intake ingest atif
 
@@ -6768,6 +6769,64 @@ nemo intake ingest otlp v1 traces create [OPTIONS]
 
 * `--output-format, --output, -f <CHOICE>`: Output format for an entity. [possible values: json, yaml, raw, code]
 
+##### nemo intake ingest spans
+
+Manage spans
+
+**Usage:**
+
+```shell
+nemo intake ingest spans [OPTIONS] COMMAND [ARGS]...
+```
+
+**Help:**
+
+* `--help, -h`: Show this message and exit.
+
+**Commands:**
+
+* `create`: Ingest Spans
+
+###### nemo intake ingest spans create
+
+Ingest Spans
+
+**Required fields:** source, spans
+
+**Examples:**
+
+```shell
+nemo intake ingest spans create --input-file spans.json
+nemo intake ingest spans create --input-data '{"source":"langsmith","spans":[{"span_id":"span-1","trace_id":"trace-1","started_at":"2026-08-14T00:00:00Z"}]}'
+echo '{"source":"langsmith","spans":[{"span_id":"span-1","trace_id":"trace-1","started_at":"2026-08-14T00:00:00Z"}]}' | nemo intake ingest spans create --input-file -
+nemo intake ingest spans create --source langsmith --spans '[{"span_id":"span-1","trace_id":"trace-1","started_at":"2026-08-14T00:00:00Z"}]'
+```
+
+**Usage:**
+
+```shell
+nemo intake ingest spans create [OPTIONS]
+```
+
+**Options:**
+
+* `--workspace`
+* `--source`: (required)
+* `--spans`: JSON string
+
+**Help:**
+
+* `--help, -h`: Show this message and exit.
+
+**Input Options:**
+
+* `--input-file`: Path to JSON file (use '-' for stdin)
+* `--input-data`: Input data for the request (JSON or YAML)
+
+**Output Options:**
+
+* `--output-format, --output, -f <CHOICE>`: Output format for an entity. [possible values: json, yaml, raw, code]
+
 #### nemo intake sessions
 
 Manage sessions