Punk-0.03

Changes for version 0.03 - 2026-08-07

Punk::Model::DBIx::Loop, a non-blocking model backend. The same six-method contract, the same SQL and the same result shapes as Punk::Model::DBI, but every method returns a Punk::Future and the statement runs on DBIx::Loop over the worker's own event loop.
It runs on DBIx::Loop's C ABI (dbil_abi.h, via ExtUtils::Depends)
Fixed Punk::Model's delegation returning the caller's own arguments alongside the backend's result.
Punk::Model::DBI is ~40% faster per statement: quote_identifier and the fixed-shape get/delete SQL are memoised on the pooled connection instead of rebuilt every call. A get is 2.05us against 3.61us. The table is part of the statement cache key - the cache is shared by every model on a dsn.
Add the `markdown` mount/keyword: point it at a nested directory of .md files and get a documentation site. Navigation reflecting the tree, a per-page table of contents from the headings, syntax highlighting, ranked search, and the images sitting alongside the markdown served as static files.
The site is built at boot. The tree is walked, every page is rendered through Markdown::Simple and wrapped by Template::Stencil, the search index is filled, and the finished bytes are frozen. A request is then a hash lookup and a triplet, with no markdown parse, no template render and no Perl frame. `reload => 1` re-renders a page whose source has changed, for the edit loop under `punk dev`.
Refactor the stat / conditional-request / sendfile half of punk_static.h out as ps_serve_file, so the markdown mount serves the assets in its tree through the same code rather than a second implementation that would drift from it.