Use org-agenda-api from GitHub instead of local path

- Change org-agenda-api input from path:../dotfiles/emacs.d/straight/repos/org-agenda-api to github:colonelpanic8/org-agenda-api
- Refactor org-agenda package building to separate org-agenda-api.nix file
- Update flake.lock with new input and fix hercules-ci-effects metadata mismatch

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

nixos/org-agenda-api.nix

@@ -0,0 +1,96 @@
+# org-agenda-api.nix - Container and config for org-agenda-api
+{ pkgs, inputs, system }:
+let
+  # Path to org-config.org in the dotfiles
+  orgConfigOrg = ../dotfiles/emacs.d/org-config.org;
+
+  # Tangle org-config.org and create a loader for the container
+  orgAgendaCustomConfig = pkgs.runCommand "org-agenda-custom-config" {
+    buildInputs = [ pkgs.emacs-nox ];
+  } ''
+    mkdir -p $out
+    mkdir -p work
+
+    # Copy org file to writable location (tangle writes to same directory)
+    cp ${orgConfigOrg} work/org-config.org
+
+    # Tangle org-config.org
+    emacs --batch \
+      --eval '(require (quote org))' \
+      --eval '(org-babel-tangle-file "work/org-config.org")'
+
+    # Copy all tangled files to output
+    for f in work/org-config-*.el; do
+      if [ -f "$f" ]; then
+        cp "$f" $out/
+      fi
+    done
+
+    # Create a loader that sets up paths and loads files in order
+    cat > $out/custom-config.el << 'ELISP'
+;;; custom-config.el --- Container config loader -*- lexical-binding: t; -*-
+
+;; Set org directory for container
+(defvar imalison:org-dir "/data/org")
+(defvar imalison:shared-org-dir nil)
+
+;; Helper function used by org-config
+(defun imalison:join-paths (&rest paths)
+  "Join PATHS together into a single path."
+  (let ((result (car paths)))
+    (dolist (p (cdr paths))
+      (setq result (expand-file-name p result)))
+    result))
+
+;; Load tangled config files in order
+(let ((config-dir (file-name-directory load-file-name)))
+  (when (file-exists-p (expand-file-name "org-config-preface.el" config-dir))
+    (load (expand-file-name "org-config-preface.el" config-dir)))
+  ;; org-config-custom.el uses customize format (var value), convert to setq
+  (when (file-exists-p (expand-file-name "org-config-custom.el" config-dir))
+    (with-temp-buffer
+      (insert-file-contents (expand-file-name "org-config-custom.el" config-dir))
+      (goto-char (point-min))
+      (condition-case nil
+          (while t
+            (let ((form (read (current-buffer))))
+              (when (and (listp form) (symbolp (car form)))
+                (set (car form) (eval (cadr form))))))
+        (end-of-file nil))))
+  (when (file-exists-p (expand-file-name "org-config-config.el" config-dir))
+    (load (expand-file-name "org-config-config.el" config-dir))))
+
+;; Capture templates for API
+(setq org-agenda-api-capture-templates
+      `(("gtd-todo"
+         :name "GTD Todo"
+         :template ("g" "GTD Todo" entry (file ,imalison:org-gtd-file)
+                    (function (lambda () (imalison:make-org-todo-template :content "%^{Title}")))
+                    :immediate-finish t)
+         :prompts (("Title" :type string :required t)))
+        ("scheduled-todo"
+         :name "Scheduled Todo"
+         :template ("s" "Scheduled" entry (file ,(imalison:join-paths imalison:org-dir "inbox.org"))
+                    "* INBOX %^{Title}\nSCHEDULED: %^{When}t\n:PROPERTIES:\n:CREATED: %U\n:END:\n"
+                    :immediate-finish t)
+         :prompts (("Title" :type string :required t)
+                   ("When" :type date :required t)))
+        ("deadline-todo"
+         :name "Todo with Deadline"
+         :template ("d" "Deadline" entry (file ,(imalison:join-paths imalison:org-dir "inbox.org"))
+                    "* INBOX %^{Title}\nDEADLINE: %^{When}t\n:PROPERTIES:\n:CREATED: %U\n:END:\n"
+                    :immediate-finish t)
+         :prompts (("Title" :type string :required t)
+                   ("When" :type date :required t)))))
+ELISP
+  '';
+
+  # Build customized org-agenda-api container
+  orgAgendaApiContainer = inputs.org-agenda-api.lib.${system}.mkContainer {
+    customElispFile = "${orgAgendaCustomConfig}/custom-config.el";
+  };
+
+in {
+  org-agenda-custom-config = orgAgendaCustomConfig;
+  org-agenda-api-container = orgAgendaApiContainer;
+}