refactor: MCP層をmcpc APIベースに刷新

- 独自JSON-RPC処理をmcpcへ置き換え
- 各MCPツールを個別ソースへ分離
- 共通コンテキストと登録処理を整理
- mcpc互換修正と統合テストを更新

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/function-coverage.md b/tests/function-coverage.md
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index 0000000..66c2e4a
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+++ b/tests/function-coverage.md
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+# Function coverage map
+
+`third_party/` is excluded. Static adapters are covered through their owning public API; pure
+byte/encoding logic is exposed through internal headers and tested directly.
+
+| Source | Functions | Test contract |
+|---|---|---|
+| `base/allocator.c` | `should_fail`, `tiny_alloc`, `tiny_calloc`, `tiny_realloc`, `tiny_free`, `tiny_allocator_reset`, `tiny_allocator_fail_after`, `tiny_allocator_call_count`, `tiny_allocator_outstanding` | `boundaries`: zero/overflow, each allocation primitive, injected failure, balance |
+| `sys/encoding.c` | `utf8_codepoint`, `tiny_utf8_to_utf16`, `tiny_utf16_to_utf8` | `boundaries`: all UTF widths, scalar edges, surrogates, overlong/truncated/invalid input, OOM |
+| `storage/codec.c` | `tiny_codec_put_u32`, `tiny_codec_put_u64`, `tiny_codec_get_u32`, `tiny_codec_get_u64`, `tiny_codec_crc32` | `boundaries`: offsets 0–15, integer limits, empty/NULL and known CRC |
+| `sys/system.c` | test-hook helpers; UTF adapters; `native_file`; argument, path, directory, file, clock and random APIs | `boundaries`, `storage`, `smoke`: NULL/invalid handle, Unicode paths, short I/O, operation failure, cleanup |
+| `domain/message.c` | `duplicate_string`, `copy_failed`, all `tiny_message_*`, role/tier parse/name, `tiny_utf8_valid`, `tiny_message_id_valid` | `domain`: enum failure, UTF-8 invalidity, ULID alphabet/length, deep copy and ownership |
+| `domain/search.c` | `decode_codepoints`, `gram_hash`, `find_bucket`, `add_gram`, `index_text`, all `tiny_search_*` | `domain`: ASCII case folding, Unicode grams/tags, candidates, scoring and ownership |
+| `storage/store.c` | error/I/O helpers, ULID, entry growth/search, record codec, replay/snapshot/recovery, all `tiny_store_*` | `storage`, `lifecycle`: lock, append/reopen, corruption, rebuild rollback, Unicode path |
+| `mcp/json.c` | `reserve`, all `tiny_json_*` | `boundaries`: empty append, growth, control escaping, signed/unsigned integer limits, OOM |
+| `mcp/server.c` | line/JSON/parser/result/search helpers, `handle_call`, `tiny_convmem_server_run` | `smoke`, `lifecycle`: initialize, list/call, malformed/EOF behavior, persistence |
+| `app/main.c` | `usage`, `run`, `main` | `requires-data-dir`, `smoke`: missing CLI argument, normal startup and EOF |