Use the full osctap/ prefix in all project includes

[tap]

What this changes

Every project include in the tree — shipped headers, tests, demos, examples, fuzz targets, and the Android JNI bridge — now uses the full "osctap/ip/..." / "osctap/osc/..." path from the repo root instead of the bare "ip/..." / "osc/..." forms. The now-redundant extra include dir (include_directories(osctap) at the root, ${OSCTAP_ROOT}/osctap in the Android build) is dropped, the ClusterFuzzLite build script and the CI fuzz-smoke job switch from -I osctap to -I ., and the doc snippets are updated to match.

Why

The headers under osctap/ included their cross-directory siblings as "ip/..." / "osc/...", which only resolves when the osctap/ directory itself is on the include path. The exported tap::osc INTERFACE target only adds the repo root, so an external CMake consumer including <osctap/ip/TcpSocket.h> failed at #include "ip/IpEndpointName.h". With the full prefix, a single include root (the repo root) serves the library's internal includes, the public <osctap/...> prefix, and the deprecated <oscpack/...> shim alike.

Two deliberate exceptions: tests/OscUnitTests.cpp keeps "OscUnitTests.h" (test-local header, resolves relative to its own file), and CompatIncludeShim.cpp keeps its <oscpack/...> includes, since regressing that path is exactly what it guards against.

Verification

• Reproduced the bug on main: a consumer TU including <osctap/ip/TcpSocket.h> with only the repo root on the include path dies at ip/IpEndpointName.h: No such file or directory. The same TU compiles clean on this branch.
• Full CMake build with OSCPACK_BUILD_EXAMPLES=ON and OSCTAP_FREESTANDING=ON: all 10 ctest tests pass, including CompatIncludeShim.
• Fuzz smoke build per the updated recipe (g++ -I . -fsanitize=address,undefined fuzz/fuzz_parse.cpp fuzz/standalone_main.cpp): replayed 4 seeds + 200k mutations, no crash.
• pre-commit run (clang-format) passes.
• Not run here: Windows/MinGW CI legs, the Android NDK build, and the ClusterFuzzLite Docker build — CI is the first real gate for those. The Pico 2 W doc snippet is doc-only and untested on hardware.

Notes for the reviewer

• Contract change. The bare-include style (-I <repo>/osctap + #include "osc/...") no longer works; the supported spellings are <osctap/...> (or the deprecated <oscpack/...>) with the repo root on the include path. Any out-of-tree consumer that copied the old bare style from the docs (e.g. the Pico snippet in EMBEDDED_PICO2W.md) needs the one-line include-path/prefix update; in-tree consumers are all migrated in this PR.
• If there is an upstream OSS-Fuzz projects/osctap build script mirroring .clusterfuzzlite/build.sh (STATUS.md hints at one), it needs the same -I osctap → -I . tweak.

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https://claude.ai/code/session_017DGP2KmVV5B9RURrXigPRZ

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