A plug-in whose manifest gives "api": 2 and lists the new `progress`
permission may import three host functions from module `env`:
vc_progress(done, total), vc_cancelled() -> i32 and
vc_log(level, ptr, len) -> i32. Installing checks every import and
refuses, by name, one the host doesn't offer, one with another type and
one the manifest doesn't allow.
- Progress is clamped and passed on once per tenth of a percent (past
2,000 reports, once per 1,000 changes). A heavy filter's progress
window and the export's progress window show it as a percentage bar,
and their Cancel makes vc_cancelled return 1. A live effect's progress
is not shown.
- A run cancelled before it returns ends as cancelled, and one that
returns after its time budget ran out ends at that budget, so what a
plug-in returns after it sees vc_cancelled changes nothing. This also
applies to a plug-in of API level 1 that finishes after a Cancel or
past its time budget.
- Log text must lie in the module's memory and be UTF-8. Lines go to the
app's log as "<id>: <text>" with hidden characters escaped, at most
1,024 characters a line, 200 lines and 32 KiB a run, and the host reads
at most 1 MiB of log text a run.
- plugin.list and plugin.info give the manifest's `api`; the install
prompt names the new permission in plain words.
Docs: docs/plugins.md, docs/mcp.md, docs/target-app-parity.md.
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