chore: release v0.8.45

[miga-heygen]

Cuts v0.8.45 from b64a7a3a, which carries both motion blur mechanisms plus HLS output.

Replaces #4021, which was prepared before #4020 merged and said the engine capability was unreachable from a render configuration. That is no longer true, so the notes were rewritten rather than patched.

Contents

PR	What it adds
#4019	Engine sub-frame multi-sample motion blur, capture-level accumulation
#4020	motionBlur on the render config, one owner for whether a render captures lossless frames
#4008	Catalog motion-blur component follows the After Effects shutter model
#4014, #4022	HLS VOD output, producer and CLI

What the notes say that a generated changelog would not

• The two blur mechanisms are alternatives. Applying both blurs the same motion twice.
• The engine path costs roughly 600 ms per 1080p frame at 16 samples, on top of the 16 captures. A slow render is expected, not stuck.
• A video's own motion does not blur on the engine path. Injected video frames are extracted once per output frame, so a sub-frame seek does not move them.
• The engine path is a plain average across the shutter window. After Effects keeps a sharp copy on top of the smear, so the engine result reads softer on fast motion even though the averaging is what a real shutter does.

Verification

• release:prepare 0.8.45 two-pass, 18 files: 15 version bumps, docs/changelog.mdx, releases/v0.8.45.md and the three plugin manifests.
• Diff checked to contain zero source changes.
• Commit signed, Miguel-only co-author trailer, local tag deleted so the workflow creates the tag at the merge SHA.

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[miga-heygen]

Superseded: this branch predates the two motion blur fixes that must be in v0.8.45 (#4025 shutter-window dedup guard, #4026 unsupported-route error). Re-cutting fresh off main rather than advancing this head.