fix(replay): re-anchor lockfile on reachable [fern-replay] init commit

`current_generation`, the second `generations[]` entry, and
`patch-4894603d.base_generation` all referenced
`b61c6fa84f61d6c77d9f4ab0fa6c2bf512c8680d` — a commit that doesn't
exist in this repo's git history (verified with `git cat-file` and
`git merge-base --is-ancestor` after a full unshallow fetch). Its
recorded `tree_hash` (`063654dc...`) is also gone from the object
database.

Likely origin: a past fern-bot PR landed via squash-merge, which
produces a new SHA on `master` distinct from the SHA recorded in the
`[fern-replay]` commit's lockfile. That recorded SHA then orphans.

Customer-visible effect: every `fern generate` loads this lockfile,
can't resolve `b61c6fa`, falls into the deepest detection fallback,
captures ~200 pre-Fern commits as orphan patches, and fails when the
resulting PR body exceeds GitHub's 65,536-char limit.

This change re-anchors all three references on
`ffe61f6a098cb25a875019a37f2615045b97344e` — the original
`[fern-replay] Initialize Replay for SDK customizations (#833)`
commit by fern-api[bot], which is reachable on master. The
generation entry's `tree_hash`, `timestamp`, and `base_branch_head`
all use the real values from that commit.

`patch-4894603d`'s `patch_content` and `theirs_snapshot` are kept
untouched. The 8208-line `theirs_snapshot` is the safety net that
lets the applicator reconstruct the customer's intended
`src/auth0/management/__init__.py` content on the next regeneration
even if the line-anchored diff's context has drifted against the new
anchor's tree.

Author: tstanmay13

.fern/replay.lock

@@ -6,21 +6,20 @@ generations:
     timestamp: 2026-04-28T17:41:46.911Z
     cli_version: unknown
     generator_versions: {}
-  - commit_sha: b61c6fa84f61d6c77d9f4ab0fa6c2bf512c8680d
-    tree_hash: 063654dc375085f1a8bea81c0b92c9f5a2416241
-    timestamp: 2026-05-01T07:46:03.366Z
+  - commit_sha: ffe61f6a098cb25a875019a37f2615045b97344e
+    tree_hash: d03a986a5da90661589bd53a6afdd5725588658c
+    timestamp: 2026-04-29T20:01:22+05:30
     cli_version: unknown
-    generator_versions:
-      fernapi/fern-python-sdk: 5.9.1
-    base_branch_head: 6e9c9a600c40b731e00bbf7f4e4285fe7758c0b5
-current_generation: b61c6fa84f61d6c77d9f4ab0fa6c2bf512c8680d
+    generator_versions: {}
+    base_branch_head: de316f0260ef1fa7c3626cbe771b167fd119439c
+current_generation: ffe61f6a098cb25a875019a37f2615045b97344e
 patches:
   - id: patch-4894603d
     content_hash: sha256:07bdd182f3a0fcf3bb41c2edeae2ae065fc98ce0dcae83201bde3e2140f9882d
     original_commit: 4894603d03409962bc60a34712de8abffe919e2c
     original_message: "chore: Restore custom wiring in management/__init__.py"
     original_author: Kunal Dawar <kunal.dawar@okta.com>
-    base_generation: b61c6fa84f61d6c77d9f4ab0fa6c2bf512c8680d
+    base_generation: ffe61f6a098cb25a875019a37f2615045b97344e
     files:
       - src/auth0/management/__init__.py
     patch_content: |