refactor: migrate Object functions to filter_functions (Phase 11)

- Add src/filter_functions/object.rs with ObjectKeys, ObjectValues, ObjectFlatten
- Register functions in filter_functions/mod.rs
- Update functions/mod.rs to remove migrated function registrations
- Add 6 integration tests for filter syntax
- Update README.md with dual syntax documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: bordeux

README.md

@@ -2525,7 +2525,7 @@ Set nested value in an object using dot-separated path notation. Creates interme
 {{ to_json(object=config, pretty=true) }}
 ```
 
-#### `object_keys(object)`
+#### `object_keys(object)` / `| object_keys`
 
 Get all keys from an object as an array.
 
@@ -2536,38 +2536,28 @@ Get all keys from an object as an array.
 
 **Examples:**
 ```jinja
-{# Get all keys #}
+{# Function syntax #}
 {% set config = {"host": "localhost", "port": 8080, "debug": true} %}
 {% set keys = object_keys(object=config) %}
 {{ to_json(object=keys) }}
 {# Output: ["host","port","debug"] #}
 
-{# Iterate over keys #}
-{% set config = {"host": "localhost", "port": 8080, "debug": true} %}
-Configuration keys:
-{% for key in object_keys(object=config) %}
-  - {{ key }}
-{% endfor %}
-{# Output:
-Configuration keys:
-  - host
-  - port
-  - debug
-#}
+{# Filter syntax #}
+{% set keys = config | object_keys %}
+{{ keys | join(sep=", ") }}
+{# Output: host, port, debug #}
 
-{# Dynamic configuration display #}
-{% set config = {
-  "SERVER_HOST": "localhost",
-  "SERVER_PORT": 8080,
-  "DATABASE_URL": "postgres://localhost/mydb"
-} %}
-# Environment Variables
-{% for key in object_keys(object=config) %}
-{{ key }}={{ config[key] }}
+{# Iterate over keys with filter syntax #}
+{% for key in config | object_keys %}
+  - {{ key }}: {{ config[key] }}
 {% endfor %}
+
+{# Chaining - get count of keys #}
+{{ config | object_keys | length }}
+{# Output: 3 #}
 ```
 
-#### `object_values(object)`
+#### `object_values(object)` / `| object_values`
 
 Get all values from an object as an array.
 
@@ -2578,30 +2568,27 @@ Get all values from an object as an array.
 
 **Examples:**
 ```jinja
-{# Get all values #}
+{# Function syntax #}
 {% set config = {"a": 1, "b": 2, "c": 3} %}
 {% set values = object_values(object=config) %}
 {{ to_json(object=values) }}
 {# Output: [1,2,3] #}
 
-{# Process all values #}
+{# Filter syntax #}
 {% set ports = {"http": 80, "https": 443, "app": 8080} %}
-Open ports:
-{% for port in object_values(object=ports) %}
+{% for port in ports | object_values %}
   - {{ port }}
 {% endfor %}
 {# Output:
-Open ports:
   - 80
   - 443
   - 8080
 #}
 
-{# Mixed type values #}
-{% set config = {"str": "hello", "num": 42, "bool": true} %}
-{% for value in object_values(object=config) %}
-  Value: {{ value }} (type: {{ type_of(value=value) }})
-{% endfor %}
+{# Chaining filters #}
+{% set scores = {"alice": 95, "bob": 87, "charlie": 92} %}
+Average: {{ scores | object_values | array_avg }}
+{# Output: Average: 91.33... #}
 ```
 
 #### `object_has_key(object, key)`
@@ -2793,7 +2780,7 @@ Rename object keys using a mapping.
 {% set api_data = object_rename_keys(object=response, mapping={"userId": "user_id", "createdAt": "created_at"}) %}
 ```
 
-#### `object_flatten(object, delimiter)`
+#### `object_flatten(object, delimiter)` / `| object_flatten`
 
 Flatten a nested object to dot-notation keys.
 
@@ -2804,22 +2791,25 @@ Flatten a nested object to dot-notation keys.
 **Returns:** A flat object with delimited keys
 
 ```jinja
+{# Function syntax #}
 {% set nested = {"server": {"host": "localhost", "port": 8080}, "database": {"name": "mydb"}} %}
-
-{# Default dot delimiter #}
 {% set flat = object_flatten(object=nested) %}
 {{ flat | tojson }}
 {# Output: {"server.host":"localhost","server.port":8080,"database.name":"mydb"} #}
 
-{# Custom delimiter #}
-{% set flat_underscore = object_flatten(object=nested, delimiter="_") %}
-{{ flat_underscore | tojson }}
-{# Output: {"server_host":"localhost","server_port":8080,"database_name":"mydb"} #}
+{# Filter syntax #}
+{% set flat = nested | object_flatten %}
+{{ flat["server.host"] }}
+{# Output: localhost #}
 
-{# Useful for environment variable generation #}
-{% for key, value in object_flatten(object=config, delimiter="_") %}
-export {{ key | upper }}="{{ value }}"
-{% endfor %}
+{# Filter syntax with delimiter #}
+{% set flat_underscore = nested | object_flatten(delimiter="_") %}
+{{ flat_underscore["server_host"] }}
+{# Output: localhost #}
+
+{# Chaining - get all flattened keys #}
+{{ nested | object_flatten | object_keys | join(sep=", ") }}
+{# Output: server.host, server.port, database.name #}
 ```
 
 #### `object_unflatten(object, delimiter)`

REFACTOR.md

@@ -649,22 +649,24 @@ These should NOT become filters (they require context, have side effects, or are
 
 **Commit:** e80aace
 
-### Phase 11: Object Functions
+### Phase 11: Object Functions ✅
 
-**Category:** `object.rs`
+**Category:** `filter_functions/object.rs`
 
 | Function | Filter | Status |
 |----------|--------|--------|
-| `object_keys` | `object_keys` | [ ] |
-| `object_values` | `object_values` | [ ] |
-| `object_flatten` | `object_flatten` | [ ] |
+| `object_keys` | `object_keys` | [x] |
+| `object_values` | `object_values` | [x] |
+| `object_flatten` | `object_flatten` | [x] |
 
-- [ ] Migrate implementations
-- [ ] Update unit tests
-- [ ] Update integration tests to test filter syntax
-- [ ] Update README.md
-- [ ] Run `cargo make qa`
-- [ ] Update REFACTOR.md with current state
+- [x] Migrate implementations to `src/filter_functions/object.rs`
+- [x] Update unit tests (existing tests still pass)
+- [x] Update integration tests to test filter syntax (6 new tests)
+- [x] Update README.md with both syntaxes
+- [x] Run `cargo make qa`
+- [x] Update REFACTOR.md with current state
+
+**Commit:** (pending)
 
 ### Phase 12: Kubernetes Functions
 

src/filter_functions/mod.rs

@@ -31,6 +31,7 @@ pub mod datetime;
 pub mod encoding;
 pub mod hash;
 pub mod math;
+pub mod object;
 pub mod path;
 pub mod serialization;
 pub mod string;
@@ -126,4 +127,9 @@ pub fn register_all(env: &mut Environment) {
     url::UrlEncode::register(env);
     url::UrlDecode::register(env);
     url::ParseUrl::register(env);
+
+    // Phase 11: Object functions
+    object::ObjectKeys::register(env);
+    object::ObjectValues::register(env);
+    object::ObjectFlatten::register(env);
 }