docs: document int64_as_number flag (5y9) Adds end-to-end coverage of the int64_as_number plugin option that landed in 8b5bfc0: - docs/reference/cli.md: row in the --tarantool_opt table + a dedicated subsection with the workload tradeoff table, the runtime-side wire helpers it exposes (wire.decode_<type>_n), and the PB_ENABLE_C=1 no-op note. - docs/codegen.md: same row in its own CLI-options table + a shorter subsection (the deep version lives in reference/cli.md). - README.md: status row for the feature; paragraph at the end of the "Migrating from a Lua proto library that auto-down-casts int64" section pitching the flag for callers who want number-on-fits semantics with cdata fallback, plus a pointer to the cli.md table. No code change.
docs: full reference + how-to set, migrate Makefile to Justfile Documentation overhaul that adds the missing user-facing surface: four reference pages (runtime-api, generated-api, cli, grpc-contract), twelve how-tos walking from first-message through custom transports, a troubleshooting page, and a docs/index map. Every how-to references a runnable artifact under examples/, all of them verified end-to-end. Build system migration: the Makefile is gone; the Justfile is now the canonical entry point and absorbs every target. examples/Justfile ships one recipe per runnable example, forwarded via top-level 'just examples <name>'. The 'examples are part of the documented surface' convention is pinned in CLAUDE.md, alongside a dedicated section on updating the conformance harness (PROTOBUF_TAG bumps, libjsoncpp path drift, new test-category wiring). Stale-number sweep across README/PLAN/CLAUDE: fixture count 18→10, test count 613/130→639, wire.lua LOC dropped, M7 marked done. Descriptor-shape block deduplicated against codegen.md as the canonical source. gRPC transports spec status reframed from 'draft / decision deferred' to 'shipped contract; external transports deferred'. .gitignore picks up *.snap / *.xlog / *.vylog / *.run / *.pid / 512.lock so example state can't leak into the working tree.