feat(budget): tx edit --budget and budget update (v0.5.0)HEADv0.5.0master

Add two deferred budget follow-ups:
- tx edit --budget: re-assign a budget on an existing transaction,
  mirroring the existing tx add --budget flag (name/id resolved, hard
  error on miss). Resolves the ISSUES.md backfill wish.
- budget update: rename a budget and/or edit its auto-budget fields via
  PUT /budgets/{id}; only fields passed are sent, empty is a hard error.

New command adds to the CLI surface without breaking callers, so this is
a MINOR bump (0.4.1 -> 0.5.0). Docs (README, SKILL.md), completion, and
TODO synced. The tx add --budget-id item stays open (still YAGNI).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/TODO.md b/TODO.md
index fe1fafc..3208c57 100644
--- a/TODO.md
+++ b/TODO.md
@@ -18,11 +18,9 @@ bash completion).
 ## Verbs on existing groups
 - [ ] `account delete` — currently needs a manual curl DELETE.
 - [ ] `tx update` / `tx delete`.
-- [ ] `tx edit --budget` — `tx add` can assign a budget (v0.4.0) but `tx edit`
-      cannot re-budget an existing transaction. Add the flag mirroring `tx add`.
-- [ ] `budget update` — rename a budget and/or edit its auto-budget fields
-      (PUT /budgets/{id} accepts name + auto_budget_*). Only enable/disable
-      (active toggle) shipped in v0.4.0; rename currently needs the web UI.
+- [x] `tx edit --budget` — mirrors `tx add --budget`. Shipped v0.5.0.
+- [x] `budget update` — rename + auto-budget fields via PUT /budgets/{id}.
+      Shipped v0.5.0.
 - [ ] `tx add --budget-id` — `--budget` resolves a name-or-id but sniffs
       all-digit refs as ids, so a budget literally named "7" is unreachable by
       name (see the ponytail note in `resolver.py`). Add an explicit