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docs/pre13-h03c.md

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+# Pre13 H03c: qstr VOP lookup adapter
+
+## Scope
+
+- Changed the private `erofs_namei()` interface to accept the bounded qstr
+  carrier directly.
+- Moved search qstr construction to the `erofs_lookup()` FreeBSD VOP adapter,
+  using exactly `cn_nameptr` and `cn_namelen` after the existing length checks.
+- Removed the temporary qstr construction from `erofs_namei()`.
+
+No changes were made to `componentname` validation, mutation rejection, `.` or
+`..` handling, vnode lock mode, `vn_vget_ino()`, `erofs_vget()`, namecache
+timing, errno mapping, readdir, directory cookies, or directory UIO handling.
+
+## Static evidence
+
+- The qstr search range is `[cn_nameptr, cn_nameptr + cn_namelen)` and does not
+  require or inspect a trailing NUL.
+- The only `erofs_namei()` caller remains `erofs_lookup()`.
+- A true `ENOENT` remains the only result eligible for negative `cache_enter()`;
+  `EINTEGRITY` and all other errors still return directly.
+- `ISDOTDOT` still selects `vn_vget_ino()` with the original `cn_lkflags`;
+  ordinary hits still select `erofs_vget()` with the same lock flags.
+- The H03c diff does not modify any `cache_enter()`, vnode lookup, lock, cookie,
+  readdir, or UIO statement.
+
+## Comparator gate
+
+Tests baseline: `ce03c283e6e2cb8f1b69c8eff21f7d06098a4fbe`.
+
+- Python deterministic corpus: PASS, 11,562 cases.
+- Independent C harness: PASS, 1,048,576 cases.
+
+The comparator gates are host static-equivalence evidence, not dynamic feature
+tests.  Dynamic H03 validation remains pending for TC042, TC043, TC044, TC045,
+TC053, TC054, TC123, TC141, and TC148, followed by the final smoke test.