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, 2 deletions

diff --git a/completions/firefly.bash b/completions/firefly.bash
index 06df14e..34171f9 100644
--- a/completions/firefly.bash
+++ b/completions/firefly.bash
@@ -42,12 +42,13 @@ _firefly() {
         "account list")     leaf_opts="--type";;
         "tx add")           leaf_opts="--budget --category --date --desc --dry-run --from --from-id --skip-dupes --tags --to --to-id --type";;
         "tx delete")        leaf_opts="--yes";;
-        "tx edit")          leaf_opts="--amount --category --date --desc --from --tags --to --type";;
+        "tx edit")          leaf_opts="--amount --budget --category --date --desc --from --tags --to --type";;
         "tx list")          leaf_opts="--account --all --flat --limit --since --until";;
         "budget create")    leaf_opts="--active --auto-budget-amount --auto-budget-period --auto-budget-type --currency --inactive";;
         "budget delete")    leaf_opts="--yes";;
         "budget limit-set") leaf_opts="--amount --currency --end --start";;
         "budget list")      leaf_opts="--end --start";;
+        "budget update")    leaf_opts="--auto-budget-amount --auto-budget-period --auto-budget-type --currency --name";;
     esac
 
     # Leaves per group.
@@ -58,7 +59,7 @@ _firefly() {
         category) leaves="list";;
         tag) leaves="list";;
         tx) leaves="add delete edit get list search";;
-        budget) leaves="create delete disable enable limit-list limit-set list";;
+        budget) leaves="create delete disable enable limit-list limit-set list update";;
     esac
 
     # Flag values: when the previous word is a flag with a fixed value set for