triage: add TASK-107 zig build transient alignment

Author: subtleGradient

.tasks/triage/TASK-107-zig-build-sqlite-transient-alignment.md

@@ -0,0 +1,49 @@
+# TASK-XXX: Zig build fails on SQLITE_TRANSIENT alignment (Zig 0.15)
+
+## Status
+- [ ] Planned
+- [ ] Assigned
+- [ ] In Progress
+- [x] Blocked (reason: Zig build failure)
+- [ ] Complete
+
+## Priority
+medium
+
+## Assigned To
+(unassigned)
+
+## Parent Docs / Cross-links
+- Triggered by: `.tasks/done/TASK-097-zig-extdata-lifecycle-test.md`
+- Related file: `zig/src/ffi/api.zig`
+
+## Description
+Running `nix run nixpkgs#zig -- build` intermittently fails (or fails on some machines/configs) on Zig 0.15 with an alignment error for the `SQLITE_TRANSIENT` constant:
+
+```
+src/ffi/api.zig:68:56: error: pointer type '?*const fn (?*anyopaque) callconv(.c) void' requires aligned address
+pub const SQLITE_TRANSIENT: DestructorFn = @ptrFromInt(@as(usize, @bitCast(@as(isize, -1))));
+```
+
+This blocks relying on a fresh Zig build inside harness scripts (though prebuilt `lib/crsqlite-zig-*` can be used as a fallback).
+
+## Files to Modify
+- `zig/src/ffi/api.zig`
+- (maybe) `zig/build.zig` (if a version-gated workaround is required)
+
+## Acceptance Criteria
+- [ ] `nix run nixpkgs#zig -- build` succeeds on Zig 0.15
+- [ ] `SQLITE_TRANSIENT` (and related sqlite destructor pointer constants) compile cleanly
+- [ ] Harness scripts no longer need a prebuilt fallback for local builds
+
+## Reproducible Command
+```bash
+cd /Users/tom/Developer/effect-native/cr-sqlite/zig
+nix run nixpkgs#zig -- build
+```
+
+## Progress Log
+### 2025-12-20
+- Observed build failure while running `bash zig/harness/test-extdata.sh`
+
+## Completion Notes