- riir.md: split project file read/write into standalone oakstorage
module (pluggable backend, DB-replaceable); add Mermaid data flow
diagram of all modules; adjust batch table and milestones
- riir/04-interfaces.md: new provides/consumes contract matrix for
all modules
- riir/M10-oakstorage.md: new manual with frozen C API (typed opaque
handles, manual vtable for storage backends, URI addressing)
- riir/01: codify pure-C OO interface rules (typed handles instead of
void*, init/free pairs, manual vtables, no C++ objects or member
calls across shared library boundaries); upper layers issue commands
only, no module-to-module event subscriptions (async task callbacks
excepted)
- sync 00/02/03 and M2-M9 manuals: remove subscribe APIs, replace
void* with typed handles, update tests accordingly
Mike-Solar
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