fix: harden transformer services per review

[JarbasAl]

Follow-up to #410 addressing the review findings, all verified against current code:

• No masked constructor errors: plugin construction now inspects the constructor signature for a config kwarg instead of catching TypeError — a TypeError raised inside a config-accepting constructor propagates to the load-error log instead of triggering a silent no-config retry.
• cancel_by cannot be injected: a plugin-supplied cancel_by outside a valid §8.1 cancellation pair is stripped before the context merge (it is orchestrator-stamped only).
• Shutdown coverage: shutdown() iterates loaded_plugins, so plugins excluded from an explicit "order" chain still get shut down.
• Feeder isolation: feed_audio/feed_hotword/feed_speech wrap each plugin call individually — one broken feeder no longer starves the rest.
• Default-context overlay: AudioTransformersService.transform merges caller context over the default context instead of discarding the defaults when a context is passed.
• Dialog blacklist enforced in the runner: dialog from a skill_id in blacklisted_skills passes through untransformed.
• Ruff-clean re-exports: the tts transformer helpers re-exported from dialog_transformers use explicit self-aliases.

Each fix has a dedicated unit test.

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c9e9e839-74a0-4375-b15e-d67e86add13a

📥 Commits

Reviewing files that changed from the base of the PR and between 59bba98 and f9ea737.

📒 Files selected for processing (5)

• docs/index.md
• docs/transformers.md
• ovos_plugin_manager/dialog_transformers.py
• ovos_plugin_manager/transformer_services.py
• test/unittests/test_transformer_services.py

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• Create PR with unit tests
• Commit unit tests in branch fix/transformer-services-review

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Checking in! Here's how the automated tests are looking. 🧐

I've aggregated the results of the automated checks for this PR below.

🔍 Lint

Checking for any potential issues or concerns. 🔍

❌ ruff: issues found — see job log

📊 Coverage

How well do we know our own code? 🧠

✅ 85.2% total coverage

Files below 80% coverage (21 files)

File	Coverage	Missing lines
ovos_plugin_manager/utils/audio.py	22.5%	69
ovos_plugin_manager/hardware/__init__.py	31.6%	13
ovos_plugin_manager/templates/gui.py	39.0%	25
ovos_plugin_manager/audio.py	40.5%	22
ovos_plugin_manager/templates/language.py	58.0%	21
ovos_plugin_manager/audio2ipa.py	58.1%	13
ovos_plugin_manager/gui.py	62.5%	15
ovos_plugin_manager/postag.py	63.0%	17
ovos_plugin_manager/segmentation.py	63.0%	17
ovos_plugin_manager/tokenization.py	63.0%	17
ovos_plugin_manager/templates/solvers.py	68.5%	82
ovos_plugin_manager/plugin_entry.py	69.1%	46
ovos_plugin_manager/coreference.py	69.2%	16
ovos_plugin_manager/templates/ocp.py	72.2%	5
ovos_plugin_manager/templates/segmentation.py	73.7%	5
ovos_plugin_manager/templates/audio2ipa.py	75.0%	3
ovos_plugin_manager/templates/postag.py	75.0%	5
ovos_plugin_manager/media_provider.py	75.7%	9
ovos_plugin_manager/templates/hotwords.py	77.4%	7
ovos_plugin_manager/persona.py	77.8%	2
ovos_plugin_manager/templates/keywords.py	78.9%	4

Full report: download the coverage-report artifact.

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✅ No license violations found.

Policy: Apache 2.0 (universal donor). StrongCopyleft / NetworkCopyleft / WeakCopyleft / Other / Error categories fail. MPL allowed.

📋 Repo Health

A routine checkup to keep the repo running smoothly. 🏥

✅ All required files present.

Latest Version: 2.10.0a1

✅ ovos_plugin_manager/version.py — Version file
✅ README.md — README
✅ LICENSE — License file
✅ pyproject.toml — pyproject.toml
⚠️ setup.py — setup.py
✅ CHANGELOG.md — Changelog
✅ ovos_plugin_manager/version.py has valid version block markers

🏷️ Release Preview

Crystal ball analysis: predicting the next version! 🔮

Current: 2.10.0a1 → Next: 2.10.1a1

Signal	Value
Label	fix
PR title	fix: harden transformer services per review
Bump	build

✅ PR title follows conventional commit format.

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🚀 Release Channel Compatibility

Predicted next version: 2.10.1a1

Channel	Status	Note	Current Constraint
Stable	❌	Too new (must be <0.10.0)	ovos-plugin-manager>=0.9.0,<0.10.0
Testing	✅	Compatible	ovos-plugin-manager>=1.0.3,<3.0.0
Alpha	✅	Compatible	ovos-plugin-manager>=2.9.0a1

🔨 Build Tests

Construction of your features is officially finished. 🏠

✅ All versions pass

Python	Build	Install	Tests
3.10	✅	✅	✅
3.11	✅	✅	✅
3.12	✅	✅	✅
3.13	✅	✅	✅
3.14	✅	✅	✅

🔒 Security (pip-audit)

I've scanned the dependencies for any hidden surprises. 🔍

✅ No known vulnerabilities found (65 packages scanned).

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