Bootstrap HK IPO historical archive

Request:
- Use the project archivist workflow to update historical IPO data.

Changes:
- Add an embedded SQLite archive at data/hk_ipo.sqlite.
- Add schema/hk_ipo.schema.sql and scripts/bootstrap_historical_data.py for reproducible archive generation.
- Archive HKEXnews source PDFs for 06658, 06675, and 06106 under repo-relative data/raw paths.
- Export Git-friendly snapshots for ipo_master, offering_terms, ipo_demand, source_refs, and data_gaps.
- Add .gitignore rules for Python cache and SQLite transient files.

Verification:
- Re-ran the bootstrap script successfully.
- Ran PRAGMA integrity_check on the SQLite database.
- Verified source_refs paths are repo-relative, files exist, and SHA-256 hashes match.
- Verified snapshot row counts match SQLite table counts.
- Ran git diff --check and searched generated durable files for machine-specific absolute paths.

data/snapshots/data_gaps.csv

@@ -0,0 +1,4 @@
+gap_id,ticker,stage,field_name,reason,expected_resolution_date,created_at,notes
+06106_allotment_results_pending_2026_06_15,06106,T1_allotment,ipo_demand,Allotment results were expected on 2026-06-23 and were not available in this seed archive.,2026-06-23,2026-06-15T06:15:00Z,Update after the HKEXnews allotment results announcement is published.
+06106_full_prospectus_classification_2026_06_15,06106,T0_prospectus,full_prospectus_local_path,The archived 2026061500011 PDF is an offering announcement/notice; the separately archived 2026061500013 PDF needs document-role verification before detailed extraction.,,2026-06-15T06:15:00Z,Keep both official files in raw archive until classification is confirmed.
+06675_allotment_results_pending_2026_06_15,06675,T1_allotment,ipo_demand,Allotment results were expected on 2026-06-16 and were not available in this seed archive.,2026-06-16,2026-06-15T06:15:00Z,Update after the HKEXnews allotment results announcement is published.

data/snapshots/ipo_demand.csv

@@ -0,0 +1,2 @@
+demand_id,ticker,source_id,stage_date,valid_applications,successful_applications,public_oversubscription_times,international_placees,international_oversubscription_times,final_hk_offer_shares,final_international_offer_shares,data_as_of,notes
+06658_allotment_2026_06_12,06658,06658_allotment_results_2026_06_12,2026-06-12,180507,11465,6586.73,64,2.64,1146500,10317600,2026-06-15T06:15:00Z,Claw-back shown as N/A in the HKEXnews allotment results.

data/snapshots/ipo_master.csv

@@ -0,0 +1,4 @@
+ticker,company_name_en,company_name_zh,stock_short_name,exchange,board,status,listing_date,application_start_date,application_end_date,allotment_results_expected_date,industry_label,data_as_of,notes
+06106,"Shanghai Seer Intelligent Technology Co., Ltd.",上海仙工智能科技股份有限公司,,HKEX,Main Board,open_for_subscription,2026-06-24,2026-06-15,2026-06-18,2026-06-23,Industrial intelligent robots / robot controllers,2026-06-15T06:15:00Z,Seeded from HKEXnews global offering announcement; full prospectus source classification needs follow-up.
+06658,"Liuliumei Co., Ltd.",溜溜梅股份有限公司,LIULIUMEI,HKEX,Main Board,listed,2026-06-15,2026-06-05,2026-06-10,2026-06-12,Snack food / preserved fruit,2026-06-15T06:15:00Z,Seeded from HKEXnews prospectus and allotment results.
+06675,"SENASIC Electronics Technology Co., Ltd.",琻捷電子科技(江蘇)股份有限公司,,HKEX,Main Board,pending_listing,2026-06-17,2026-06-09,2026-06-12,2026-06-16,Automotive wireless sensing SoC / semiconductors,2026-06-15T06:15:00Z,Seeded from HKEXnews prospectus and global offering announcement; allotment results not yet archived.

data/snapshots/offering_terms.csv

@@ -0,0 +1,4 @@
+ticker,source_id,prospectus_date,offer_price_hkd,board_lot,min_subscription_amount_hkd,global_offer_shares,hk_offer_shares_initial,international_offer_shares_initial,public_offer_pct_initial,over_allotment_offer_shares,offer_size_adjustment_offer_shares,market_cap_hkd_m,gross_proceeds_hkd_m,net_proceeds_hkd_m,issued_shares_upon_listing,data_as_of
+06106,06106_prospectus_notice_2026_06_15,2026-06-15,101.6,50,5131.24,10497300,524900,9972400,0.05,1574550,1574550,,,,,2026-06-15T06:15:00Z
+06658,06658_prospectus_2026_06_05,2026-06-05,43.58,100,4401.96,11464100,1146500,10317600,0.1,,,3434.59,499.6,440.1,78811208,2026-06-15T06:15:00Z
+06675,06675_global_offering_announcement_2026_06_09,2026-06-09,18.36,200,3709.04,53407000,5340800,48066200,0.1,8011000,,6959.2,,906.7,379041820,2026-06-15T06:15:00Z

data/snapshots/source_refs.csv

@@ -0,0 +1,7 @@
+source_id,ticker,source_type,title,path_base,local_path,url,file_sha256,source_date,archived_at,notes
+06106_prospectus_candidate_2026_06_15,06106,prospectus_candidate_pending_verification,"Shanghai Seer Intelligent Technology Co., Ltd. Prospectus Candidate",repo_root,data/raw/06106/prospectus_candidate_2026-06-15.pdf,https://www1.hkexnews.hk/listedco/listconews/sehk/2026/0615/2026061500013.pdf,e8b129296563e43b7834be9d59ac41926fbaeb4f088da2c908b1f04b4151967b,2026-06-15,2026-06-15T06:15:00Z,Downloaded from HKEXnews; document role should be verified before using for detailed fact extraction.
+06106_prospectus_notice_2026_06_15,06106,prospectus_notice,"Shanghai Seer Intelligent Technology Co., Ltd. Prospectus Notice",repo_root,data/raw/06106/prospectus_notice_2026-06-15.pdf,https://www1.hkexnews.hk/listedco/listconews/sehk/2026/0615/2026061500011.pdf,510983deaba5614975a57c5e77d3ea83af071a24609c28cd3f89914e1649bff5,2026-06-15,2026-06-15T06:15:00Z,HKEXnews announcement containing global offering terms and timetable.
+06658_allotment_results_2026_06_12,06658,allotment_results,"Liuliumei Co., Ltd. Announcement of Allotment Results",repo_root,data/raw/06658/allotment_results_2026-06-12.pdf,https://www1.hkexnews.hk/listedco/listconews/sehk/2026/0612/2026061202100.pdf,bb305cf55cc87809ecd845ea44243c4f41fcfaa31dbf496580e2ed8fc06d54a0,2026-06-12,2026-06-15T06:15:00Z,HKEXnews allotment results.
+06658_prospectus_2026_06_05,06658,prospectus,"Liuliumei Co., Ltd. Prospectus",repo_root,data/raw/06658/prospectus_2026-06-05.pdf,https://www1.hkexnews.hk/listedco/listconews/sehk/2026/0605/2026060500023.pdf,e928dd8082e8aaf28156a46f64c98bee308d8ae4d10a9571a4531a3f9a8f0eb1,2026-06-05,2026-06-15T06:15:00Z,HKEXnews prospectus.
+06675_global_offering_announcement_2026_06_09,06675,global_offering_announcement,"SENASIC Electronics Technology Co., Ltd. Global Offering Announcement",repo_root,data/raw/06675/global_offering_announcement_2026-06-09.pdf,https://www.hkexnews.hk/listedco/listconews/sehk/2026/0609/2026060900009.pdf,a6b0c03d6b7a42cab0865aa0abf6dfa2dd80e6d16e392d73ddd3cd3839f7aeff,2026-06-09,2026-06-15T06:15:00Z,HKEXnews global offering announcement.
+06675_prospectus_2026_06_09,06675,prospectus,"SENASIC Electronics Technology Co., Ltd. Prospectus",repo_root,data/raw/06675/prospectus_2026-06-09.pdf,https://www.hkexnews.hk/listedco/listconews/sehk/2026/0609/2026060900029.pdf,0c0c634786b7e7da921dd631fa7ba696043fae4ab29cf29dcc5f9e976c53b160,2026-06-09,2026-06-15T06:15:00Z,HKEXnews prospectus.