feat: initial text-summarize v0.1.0 (text.summarize@0.1.0)

Ollama-backed summarisation module — fourth real F∆I capability,
following text.extract / llm.chat / text.translate. Completes
the text-processing trio for compose-grade workflows
(extract -> translate -> summarise, or any subset).

Capability:
  Inputs:
    text       : text   (source text)
    style      : text   (e.g. "one paragraph", "three bullets";
                          defaults to "one paragraph")
    language   : text   (output language hint; empty = source)
    endpoint   : text   (Ollama /api/chat URL)
    model      : text
    api_key    : text   (optional)

  Outputs:
    summary        : text
    style          : text   (echo for audit)
    language       : text   (echo for audit)
    model_endpoint : text
    model_name     : text
    model_digest   : text   (Ollama /api/show probe; empty for
                              non-Ollama or transient failures)

  Permissions: net to localhost / 127.0.0.1 / api.openai.com /
               api.anthropic.com.

System prompt is conservative: faithful, neutral, preserves
named entities, no editorialising, no metadata. Reuses the LLM
client + digest-probe pattern from llm-chat / text-translate;
the duplication is acceptable at four modules and will be
factored into a shared crate when a fifth lands.

15 host-side tests cover prompt-building (style + language +
empty-language), Ollama-shaped response parsing, URL transform,
digest extraction, end-to-end success / probe-failure / non-
Ollama paths.

Wasm artifact: 118 KB. Built with v1.0 fai:platform imports.
Bootstrapped via 'fai new module text.summarize'.

Signed-off-by: flemming-it <sf@flemming.it>

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