feat(checker): cph-check orchestrator + cph-cli cph binary (WU-5)

Closes the core pipeline: the `cph` CLI checks an engineering file and compiles
a PDF.

cph-check — phases (a) load → (b) structural (known-kind set) → (c) schema →
(d) typst compile → (e) render-coverage. Compile is gated: skipped if (a)-(c)
produced any Error (broken input would only add noise); `check` compiles every
declared target (dedup identical diags), `build` compiles the one requested.
Render-coverage emits a non-blocking RenderIgnored *warning* when a (kind,
target) has no render rule — severity pinned via RENDER_IGNORED_SEVERITY const
citing spec Diagnostic.renderIgnoredSeverity + ADR-0005. No double-emit:
unknown/missing parts are skipped downstream. API: check(root, engine) ->
CheckReport, build(root, engine, target) -> (Option<pdf>, CheckReport).

cph-cli — clap: `cph check <path>` (exit 1 on any Error, warnings → 0) and
`cph build <path> --target <name> [-o out]` (default target student, default
out <path>/build/<target>.pdf). Diagnostics → stderr via Display, results →
stdout. --render-dir override.

End-to-end on examples/TH-141 (39 parts): `check` → 0 errors/0 warnings;
`build` → real PDF student 9pp/395KB, teacher 12pp/474KB. Broken-element check
(unclosed delimiter in a stmt.typ) → span-accurate
`error[E-TYPST-COMPILE]: unclosed delimiter --> lemmas/…/stmt.typ:7:8`, exit 1.
Workspace: fmt + clippy -D warnings + test all green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -17,6 +17,56 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "anstream"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"
+
+[[package]]
+name = "anstyle-parse"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys",
+]
+
 [[package]]
 name = "approx"
 version = "0.5.1"
@@ -222,6 +272,46 @@ dependencies = [
  "serde_path_to_error",
 ]
 
+[[package]]
+name = "clap"
+version = "4.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ddb117e43bbf7dacf0a4190fef4d345b9bad68dfc649cb349e7d17d28428e51"
+dependencies = [
+ "clap_builder",
+ "clap_derive",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "714a53001bf66416adb0e2ef5ac857140e7dc3a0c48fb28b2f10762fc4b5069f"
+dependencies = [
+ "anstream",
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2ce8604710f6733aa641a2b3731eaa1e8b3d9973d5e3565da11800813f997a9"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
+
 [[package]]
 name = "cobs"
 version = "0.3.0"
@@ -255,6 +345,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
 
+[[package]]
+name = "colorchoice"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
+
 [[package]]
 name = "comemo"
 version = "0.5.1"
@@ -291,10 +387,22 @@ dependencies = [
 [[package]]
 name = "cph-check"
 version = "0.1.0"
+dependencies = [
+ "cph-diag",
+ "cph-model",
+ "cph-schema",
+ "cph-typst",
+]
 
 [[package]]
 name = "cph-cli"
 version = "0.1.0"
+dependencies = [
+ "clap",
+ "cph-check",
+ "cph-diag",
+ "cph-typst",
+]
 
 [[package]]
 name = "cph-diag"
@@ -1101,6 +1209,12 @@ version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a588916bfdfd92e71cacef98a63d9b1f0d74d6599980d11894290e7ddefffcf7"
 
+[[package]]
+name = "is_terminal_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
+
 [[package]]
 name = "itoa"
 version = "1.0.18"
@@ -1338,6 +1452,12 @@ version = "1.21.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50"
 
+[[package]]
+name = "once_cell_polyfill"
+version = "1.70.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
+
 [[package]]
 name = "option-ext"
 version = "0.2.0"
@@ -2028,6 +2148,12 @@ dependencies = [
  "float-cmp",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
+
 [[package]]
 name = "strum"
 version = "0.27.2"
@@ -2807,6 +2933,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
 
+[[package]]
+name = "utf8parse"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
+
 [[package]]
 name = "vello_common"
 version = "0.0.8"