fix: release active fraction after sealing on startup and shutdown

[eguguchkin]

This is a minor fix that removes leftover files after sealing, both on startup and on shutdown. Currently, WAL files may remain undeleted after sealing. This isn't critical though, since they get cleaned up automatically when the store restarts.

---

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.95%. Comparing base (e1ed059) to head (0585e79).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
- Coverage   70.97%   70.95%   -0.02%     
==========================================
  Files         232      232              
  Lines       18293    18295       +2     
==========================================
- Hits        12984    12982       -2     
- Misses       4336     4339       +3     
- Partials      973      974       +1     

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[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

Show table

Name	Previous	Current	Ratio	Verdict
AggDeep/size=1000-4	e1ed05	32fc85
	5152.00 ns/op	6494.00 ns/op	1.26	🔴
AggDeep/size=10000-4	e1ed05	32fc85
	51317.00 ns/op	63045.00 ns/op	1.23	🔴
AggDeep/size=1000000-4	e1ed05	32fc85
	5230924.00 ns/op	6515544.00 ns/op	1.25	🔴
AggWide/size=1000-4	e1ed05	32fc85
	5168.00 ns/op	6486.00 ns/op	1.26	🔴
AggWide/size=10000-4	e1ed05	32fc85
	50505.00 ns/op	66775.00 ns/op	1.32	🔴
AggWide/size=1000000-4	e1ed05	32fc85
	529.00 B/op	695.00 B/op	1.31	🔴
	5671609.00 ns/op	7172092.00 ns/op	1.26	🔴
And/size=1000-4	e1ed05	32fc85
	5.05 ns/op	6.26 ns/op	1.24	🔴
And/size=10000-4	e1ed05	32fc85
	5.05 ns/op	6.28 ns/op	1.24	🔴
And/size=1000000-4	e1ed05	32fc85
	4.52 ns/op	5.77 ns/op	1.28	🔴
AndTree/size=1000-4	e1ed05	32fc85
	4.41 ns/op	5.61 ns/op	1.27	🔴
AndTree/size=10000-4	e1ed05	32fc85
	4.41 ns/op	5.70 ns/op	1.29	🔴
AndTree/size=1000000-4	e1ed05	32fc85
	4.81 ns/op	6.03 ns/op	1.25	🔴
Bitmask-4	e1ed05	32fc85
	223724052.00 ns/op	290126816.00 ns/op	1.30	🔴
Block_Pack-4	e1ed05	32fc85
	109010.00 ns/op	144014.00 ns/op	1.32	🔴
Block_Unpack-4	e1ed05	32fc85
	92335.00 ns/op	126668.00 ns/op	1.37	🔴
BucketClean-4	e1ed05	32fc85
	45283.00 ns/op	56506.00 ns/op	1.25	🔴
Complex/size=1000-4	e1ed05	32fc85
	5.05 ns/op	6.24 ns/op	1.24	🔴
Complex/size=10000-4	e1ed05	32fc85
	5.05 ns/op	6.15 ns/op	1.22	🔴
Complex/size=1000000-4	e1ed05	32fc85
	5.54 ns/op	7.28 ns/op	1.31	🔴
ESBulk-4	e1ed05	32fc85
	4767.63 MB/s	3923.88 MB/s	0.82	🔴
	67615.00 ns/op	82062.00 ns/op	1.21	🔴
FindSequence_Random/extra-large-4	e1ed05	32fc85
	9692.29 MB/s	8590.30 MB/s	0.89	🔴
	108262.00 ns/op	122065.00 ns/op	1.13	🔴
FindSequence_Random/large-4	e1ed05	32fc85
	15730.57 MB/s	13525.07 MB/s	0.86	🔴
	1042.00 ns/op	1211.00 ns/op	1.16	🔴
FindSequence_Random/medium-4	e1ed05	32fc85
	9811.02 MB/s	8134.53 MB/s	0.83	🔴
	104.60 ns/op	125.90 ns/op	1.20	🔴
FindSequence_Random/small-4	e1ed05	32fc85
	6282.24 MB/s	5232.38 MB/s	0.83	🔴
	40.80 ns/op	48.93 ns/op	1.20	🔴
FindSequence_Random/tiny-4	e1ed05	32fc85
	2537.71 MB/s	1942.00 MB/s	0.77	🔴
	25.22 ns/op	32.96 ns/op	1.31	🔴
Indexer-4	e1ed05	32fc85
	271028262.00 ns/op	312290820.00 ns/op	1.15	🔴
MergeQPRs_ReusingQPR-4	e1ed05	32fc85
	3722025.00 ns/op	4436275.00 ns/op	1.19	🔴
MergeSource-4	e1ed05	32fc85
	1649170920.00 ns/op	2031333041.00 ns/op	1.23	🔴
MutexListAppend-4	e1ed05	32fc85
	184.95 MB/s	166.97 MB/s	0.90	🔴
NAnd/size=1000-4	e1ed05	32fc85
	4.68 ns/op	5.76 ns/op	1.23	🔴
NAnd/size=10000-4	e1ed05	32fc85
	4.70 ns/op	5.80 ns/op	1.24	🔴
NAnd/size=1000000-4	e1ed05	32fc85
	4.79 ns/op	6.14 ns/op	1.28	🔴
Not/size=1000-4	e1ed05	32fc85
	5.03 ns/op	6.67 ns/op	1.33	🔴
Not/size=10000-4	e1ed05	32fc85
	5.04 ns/op	6.40 ns/op	1.27	🔴
Not/size=1000000-4	e1ed05	32fc85
	5.21 ns/op	7.06 ns/op	1.35	🔴
NotEmpty/size=1000-4	e1ed05	32fc85
	5.05 ns/op	6.18 ns/op	1.22	🔴
NotEmpty/size=10000-4	e1ed05	32fc85
	5.05 ns/op	6.18 ns/op	1.22	🔴
NotEmpty/size=1000000-4	e1ed05	32fc85
	5.04 ns/op	6.57 ns/op	1.30	🔴
Or/size=1000-4	e1ed05	32fc85
	4.64 ns/op	5.91 ns/op	1.27	🔴
Or/size=10000-4	e1ed05	32fc85
	4.67 ns/op	5.83 ns/op	1.25	🔴
Or/size=1000000-4	e1ed05	32fc85
	4.71 ns/op	5.81 ns/op	1.23	🔴
OrTree/size=1000-4	e1ed05	32fc85
	4.69 ns/op	6.08 ns/op	1.30	🔴
OrTree/size=10000-4	e1ed05	32fc85
	4.68 ns/op	5.82 ns/op	1.24	🔴
OrTree/size=1000000-4	e1ed05	32fc85
	5.45 ns/op	7.25 ns/op	1.33	🔴
OrTreeNextGeq/size=1000-4	e1ed05	32fc85
	4.68 ns/op	5.92 ns/op	1.26	🔴
OrTreeNextGeq/size=10000-4	e1ed05	32fc85
	4.68 ns/op	5.58 ns/op	1.19	🔴
OrTreeNextGeq/size=1000000-4	e1ed05	32fc85
	5.26 ns/op	6.72 ns/op	1.28	🔴
ParseESTime/es_stdlib-4	e1ed05	32fc85
	198.70 ns/op	258.10 ns/op	1.30	🔴
ParseESTime/handwritten-4	e1ed05	32fc85
	44.03 ns/op	54.66 ns/op	1.24	🔴
ParseESTime/rfc3339-4	e1ed05	32fc85
	57.38 ns/op	70.68 ns/op	1.23	🔴
ProcessDocuments-4	e1ed05	32fc85
	13324.00 B/op	16233.00 B/op	1.22	🔴
	92.83 MB/s	75.59 MB/s	0.81	🔴
	4444012.00 ns/op	5450114.00 ns/op	1.23	🔴
Sealing_NoSort-4	e1ed05	32fc85
	1194959516.00 ns/op	1475503447.00 ns/op	1.23	🔴
Sealing_WithSort-4	e1ed05	32fc85
	2294962601.00 ns/op	2893513469.00 ns/op	1.26	🔴
SeqListAppend-4	e1ed05	32fc85
	116.04 MB/s	100.71 MB/s	0.87	🔴
	137913962.00 ns/op	158878232.00 ns/op	1.15	🔴
SeqQLParsing-4	e1ed05	32fc85
	1266.00 ns/op	1653.00 ns/op	1.31	🔴
SeqQLParsingLong-4	e1ed05	32fc85
	10973.00 ns/op	13701.00 ns/op	1.25	🔴