feat(tts): Update model index with Magpie v2607 GGUF

[pskrunner14]

Summary by CodeRabbit

• New Features
  • Model downloads now support retrieving selected portions of an archive, reducing unnecessary data transfer when installing directory-based artifacts.
  • The Magpie TTS model is updated to v2607, and the documented setup workflow uses nemo-speech pull magpie.
• Documentation
  • Updated Magpie model path examples to use magpie.gguf.
  • Clarified differences between Magpie v2602 and v2607, including how streaming chunk grouping works.

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• app/model_store.cpp
• tests/cli/model_store_test.py

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📝 Walkthrough

Walkthrough

The model store now supports validated tar-ranges artifacts and bounded TAR extraction. The Magpie model index uses updated artifacts and tokenizer metadata. Configuration examples and documentation use the magpie.gguf path and describe the updated model workflow.

Changes

Ranged tokenizer artifacts and Magpie updates

Layer / File(s)	Summary
Range metadata and model index app/model_store.cpp, models/index.json	The model store validates tar-ranges metadata. The Magpie index declares two tokenizer ranges and updates the model revision, GGUF artifact, and tokenizer manifest.
Ranged download and extraction app/model_store.cpp, tests/cli/model_store_test.py	The model store downloads and assembles declared byte ranges, extracts bounded TAR segments, and applies archive cache and materialization handling. The CLI test checks the requested ranges and extracted tokenizer content.
Magpie model paths and examples config/*.yaml, docs/server.md, docs/tts/*, src/tts/magpietts/README.md	Configuration and invocation examples use magpie.gguf. The Magpie documentation describes the unified pull workflow and distinguishes v2602 generation from v2607 frame stacking.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant ModelStore
  participant HTTPServer
  participant TARExtractor
  ModelStore->>HTTPServer: Request declared byte ranges
  HTTPServer-->>ModelStore: Return archive segments
  ModelStore->>TARExtractor: Extract bounded TAR segments
  TARExtractor-->>ModelStore: Write selected tokenizer members

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Suggested reviewers: anand-nv

Merge Risk: 🟡 Moderate · up to 14e26

The documented Magpie commands will not find files produced by the indexed pull unless users manually move or rename them. Align those paths before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the Magpie v2607 GGUF model-index update, which is a central change in the pull request.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@docs/server.md`:
- Line 24: Update the Magpie model value in docs/server.md:24 and
docs/tts/configuration.md:20, 92, 103, and 125 to use the indexed alias magpie
(or explicitly document staging and renaming the revisioned artifact at each
example). Ensure all five examples resolve through the indexed Magpie model
cache instead of assuming models/magpie-tts/magpie.gguf.

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📥 Commits

Reviewing files that changed from the base of the PR and between a5b6953 and 8c78957.

📒 Files selected for processing (10)

• app/model_store.cpp
• config/server.example.yaml
• config/tts.example.yaml
• docs/clients.md
• docs/server.md
• docs/tts/configuration.md
• docs/tts/models.md
• models/index.json
• src/tts/magpietts/README.md
• tests/cli/model_store_test.py

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[pskrunner14]

/ok to test dbb0d10

[pskrunner14]

/ok to test 14e26e0

[anand-nv]

Approved