feat: add source hyperlinks + remove thin from-source.md

Every source reference now links to elixir-lang/elixir at commit f4e1b34.
122 hyperlinks across 11 topic files. Added PATTERN_COMPLETE sentinels.
Removed from-source.md (326 lines, shallow) — covered by existing files.

patterns/typespecs.md

@@ -6,7 +6,7 @@ Patterns extracted from the Elixir standard library source code.
 
 ## 1. Public Type with @typedoc
 
-**Source:** `lib/elixir/lib/gen_server.ex` lines 862–896
+**Source:** [lib/elixir/lib/gen_server.ex#L862](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/gen_server.ex#L862)
 
 **What it does:** Every public `@type` is preceded by a `@typedoc` that explains what the type represents, often referencing which functions use it.
 
@@ -91,7 +91,7 @@ the current state of a user account.
 
 ## 2. Private Types with @typep
 
-**Source:** `lib/elixir/lib/macro.ex` lines 84, 97
+**Source:** [lib/elixir/lib/macro.ex#L84](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/macro.ex#L84), 97
 
 **What it does:** Uses `@typep` for internal recursive type definitions that are implementation details not meant for external consumers.
 
@@ -190,7 +190,7 @@ end
 
 ## 3. @opaque Types (Protocol t())
 
-**Source:** `lib/elixir/lib/protocol.ex` lines 150–168 (documentation), runtime generation
+**Source:** [lib/elixir/lib/protocol.ex#L150](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/protocol.ex#L150) (documentation), runtime generation
 
 **What it does:** Protocols auto-generate an opaque `@type t :: term()` type that represents "any value implementing this protocol."
 
@@ -269,7 +269,7 @@ end
 
 ## 4. Union Types in @spec Return Values
 
-**Source:** `lib/elixir/lib/gen_server.ex` lines 577–583, 647–658
+**Source:** [lib/elixir/lib/gen_server.ex#L577](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/gen_server.ex#L577), 647–658
 
 **What it does:** Uses union types with descriptive tagged tuples in callback specs, making all possible return shapes explicit.
 
@@ -355,7 +355,7 @@ end
 
 ## 5. `when` Constraints in Specs
 
-**Source:** `lib/elixir/lib/kernel.ex` lines 635, 1072, 1455
+**Source:** [lib/elixir/lib/kernel.ex#L635](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/kernel.ex#L635), 1072, 1455
 
 **What it does:** Uses the `when` clause in `@spec` to bind type variables, expressing relationships between parameters and return values.
 
@@ -414,7 +414,7 @@ end
 
 ## 6. Map Types with required/optional Keys
 
-**Source:** `lib/elixir/lib/supervisor.ex` lines 602–607, 644–652
+**Source:** [lib/elixir/lib/supervisor.ex#L602](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/supervisor.ex#L602), 644–652
 
 **What it does:** Uses map type syntax with `required()` and `optional()` keys to define struct-like specs where some fields have defaults.
 
@@ -499,7 +499,7 @@ end
 
 ## 7. Keyword List Types for Options
 
-**Source:** `lib/logger/lib/logger.ex` lines 509–531
+**Source:** [lib/logger/lib/logger.ex#L509](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/logger/lib/logger.ex#L509)
 
 **What it does:** Defines option types as keyword lists with specific key-value constraints, sometimes nested.
 
@@ -588,7 +588,7 @@ end
 
 ## 8. Parameterized Types (t/1)
 
-**Source:** `lib/elixir/lib/enum.ex` lines 58–73 (Enumerable protocol)
+**Source:** [lib/elixir/lib/enum.ex#L58](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/enum.ex#L58) (Enumerable protocol)
 
 **What it does:** Defines a parameterized type `t(_element)` that allows expressing the element type of an enumerable in function specs.
 
@@ -670,7 +670,7 @@ integers and returns an enumerable of strings:
 
 ## 9. Named Parameters in Specs (:: annotation)
 
-**Source:** `lib/elixir/lib/gen_server.ex` line 577, `lib/elixir/lib/supervisor.ex` line 562
+**Source:** [lib/elixir/lib/gen_server.ex#L577](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/gen_server.ex#L577), [lib/elixir/lib/supervisor.ex#L562](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/supervisor.ex#L562)
 
 **What it does:** Uses `name :: type` syntax in callback/spec parameter positions to give meaningful names to parameters.
 
@@ -735,7 +735,7 @@ integers and returns an enumerable of strings:
 
 ## 10. @typedoc since: Annotation
 
-**Source:** `lib/elixir/lib/supervisor.ex` lines 669–670, `lib/elixir/lib/enum.ex` line 72
+**Source:** [lib/elixir/lib/supervisor.ex#L669](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/supervisor.ex#L669), [lib/elixir/lib/enum.ex#L72](https://github.com/elixir-lang/elixir/blob/f4e1b34617ef92052b65781f18eae5b88a490098/lib/elixir/lib/enum.ex#L72)
 
 **What it does:** Attaches a `since:` metadata annotation to `@typedoc` indicating when a type was introduced.
 
@@ -797,3 +797,5 @@ end
 ```
 
 **Why:** `since:` annotations are for library consumers checking compatibility across versions. Application code doesn't have "consumers" checking which version introduced a type — it's all deployed together.
+
+<!-- PATTERN_COMPLETE -->